JPH10107768A - Mobile communication method and its system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the communication quality of a communication channel and to increase a subscriber capacity of a communication system by providing a plurality of antennas to a base station and sending a different pilot signal to each antenna. SOLUTION: A coding means 0201 encodes audio information and image information or the like addressed to a mobile station 1. A spread means uses a spread code 1 assigned to the mobile station 1 to spread a signal band. The spread signal is connected to a multiplexer means 0213 or 0214 according to an instruction of a selection means 0210 in a changeover means 0207. The information addressed to mobile stations 2, 3 is processed similarly. The selection means 0210 selects an antenna to send a signal of each channel and gives an instruction to changeover means 0207, 0208 or 0209. A pilot signal of an antenna A is spread for a signal band by a spread code assigned to the antenna A by a spread means 0211. The spread pilot signal is multiplexed by a multiplexer 0213 with spread signals of other channels sent from the antenna A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication method and apparatus using code division multiple access for securing a communication line using radio for a mobile object that moves widely indoors and outdoors. .

[0002]

2. Description of the Related Art In digital mobile communication, a multiple access system is a line connection system in which a plurality of stations simultaneously communicate in the same band. Code Division Multiple Access (CDMA)
Is a technique for performing multiple access by spread spectrum communication in which the spectrum of an information signal is spread over a band sufficiently larger than the original information bandwidth and transmitted. Also referred to as spread spectrum multiple access (SSMA). What is the direct diffusion method?
This is a method of directly multiplying an information signal by a spreading sequence code in spreading. In direct-sequence CDMA, since multiple communications share the same frequency, there is a problem (a near-far problem) in which the intensity of the interference wave (communication wave of another station) at the receiving end and the desired wave is the same,
Overcoming this is the premise of realizing a CDMA transmission system. The perspective problem becomes more severe with base station reception, which receives radio waves from many stations at different locations at the same time.
Transmission power control according to the state of each transmission path is essential. On the other hand, when the reception power of a specific reception signal is stronger than that of another signal, the reliability of that signal increases.

[0003] Time Division Duplex:
Hereafter referred to as TDD) is the same transmission and reception band system,
Also called a ping-pong transmission method, the same radio frequency is divided into time units called slots, and transmission and reception are performed alternately. As an advantage of the TDD scheme, it is known that transmission diversity can be easily applied to a base station, so that spatial diversity is not required in a mobile station, and miniaturization can be achieved. Also, among the detection methods in digital communication, the synchronous detection method has better static characteristics than the delay detection method, and requires the lowest Eb / IO required to obtain a certain average bit error rate (BER). It is.

[0004] A received wave that has passed through a moving propagation path is subject to a change called fading, which is a cause of deterioration of a transmission system. In order to realize high quality transmission, there is a diversity technique as a technique for reducing the influence of the fading. Reception space diversity is one of the diversity techniques for receiving using two or more reception antennas. By arranging antennas spatially separated from each other, it is possible to regard the fading received by the received waves of each antenna as independent fluctuation. Fading fluctuations can be reduced by selecting and switching antennas with good reception conditions from among a plurality of received waves having independent fading fluctuations, or by synthesizing the received waves of each antenna with the same phase. . On the other hand, the transmission space diversity is a diversity technique for transmitting using two or more transmission antennas, and among a plurality of transmission antennas, one having a good transmission path state of a communication line with a mobile station. By selectively transmitting the antenna by switching the antenna, it is possible to reduce the fading fluctuation of the received wave in the mobile station.

As a method of compensating for distortion of a transmission signal due to fading, an interpolation type synchronous detection method has been proposed (Seiichi Sanjo, "Fading distortion compensation method for 16QAM for land mobile communication", IEICE B-II). Vol.J72-B-II No.1 pp.7-
15,1989). In this method, a pilot symbol is periodically inserted into an information symbol to be transmitted, and a channel transfer function, that is, a state of a line is estimated to perform detection. In addition, a scheme that applies the above scheme to direct sequence CDMA has been proposed (Higashi, Taguchi, Ohno, "Characteristics of interpolation type synchronous detection RAKE in DS / CDMA" IEICE Technical Report RCS94-98,199
Four).

FIG. 22 schematically shows a base station and a mobile station within its communication area in a direct spread CDMA system employing such an interpolation type synchronous detection RAKE system. This is an example of a case where two mobile stations are simultaneously communicating with five mobile stations. In FIG. 22, reference numeral 0001 denotes a base station, which includes an antenna, a radio unit, a modem unit, a codec unit, and the like. 0002 is an antenna A, and 0003 is an antenna B, which performs transmission of a downlink radio signal and reception of an uplink radio signal. [0004] A mobile station (1) is composed of an antenna, a radio unit, a modem unit, a codec unit and the like. 0005,0006,00
Reference numerals 07 and 0008 denote a mobile station (2), a mobile station (3), a mobile station (4), and a mobile station (5), respectively, which are configured similarly to the mobile station (1). FIG. 23 shows a symbol configuration of a slot in this system. This figure is an example in which pilot symbols are arranged at the beginning and end of a slot, where 0101 and 0102 indicate pilot symbols and 0103 indicates information symbols.

FIG. 24 shows a time transition of signals transmitted from two antennas of a base station when transmission diversity is applied to the above-described method. In FIG. 24, the base station
Estimate the line condition between the mobile station (1) and each antenna,
A signal (hereinafter referred to as TCH-1) destined for the mobile station (1) is transmitted from an antenna having a good line condition. Signals to mobile station (2) (hereinafter TCH-2), signals to mobile station (3) (TCH-3), signals to mobile station (4) (TC)
The same applies to signals to mobile station (5) (hereinafter referred to as TCH-5). Signal to each mobile station, TCH-
1, the antenna transmitting TCH-2, TCH-3, TCH-4, and TCH-5 is determined in a time slot cycle or several slots as one cycle. In time slot 1, antenna A multiplexes and transmits TCH-1, TCH-2, and TCH-3, and antenna B multiplexes and transmits TCH-4 and TCH-5. In time slot 2, TCH-2 and TCH-3 are multiplexed and transmitted from antenna A, and TCH-1, TCH-4 and TCH-5 are multiplexed and transmitted from antenna B.
In time slot 3, TCH-3 is transmitted from antenna A, and TCH-1, TCH-2, TCH-4, TC
H-5 is multiplexed and transmitted.

[0008] Since an information signal addressed to each mobile station is transmitted from the same antenna for each slot, pilot symbols and information symbols are transmitted from the same antenna to the mobile station via the same path.
Line conditions due to fading and the like are equal. Therefore, it is possible to estimate the reference phase and the delay profile using the pilot symbols of each signal.

[0009] Another scheme that enables synchronous detection in direct sequence CDMA is a pilot channel. This is a system in which one channel (spreading code) is constantly transmitted as a detection reference signal independently of a channel for transmitting information data. FIG. 25 shows a time transition of signals transmitted from a plurality of antennas of the base station in this system. This figure shows an example in which the base station has one antenna and is simultaneously communicating with five mobile stations. In FIG. 25, in each time slot, PCH, TCH-1, TCH-2
, TCH-3, TCH-4, and TCH-5 are multiplexed and transmitted.

[0010] Since the pilot channel and the information signal addressed to each mobile station are transmitted from the same antenna and reach the mobile station via the same path, the line conditions due to fading and the like are equal. Therefore, it is possible to estimate the reference phase and the delay profile using the pilot symbols of each signal. Phase estimation is performed from the pilot channel by despreading, and synchronous detection of the information signal is performed. In this case, in order to increase the reliability of the pilot signal, the pilot signal may be transmitted with higher power than a channel for transmitting other information signals.

There is also site diversity for transmitting signals from a plurality of base stations to one mobile station. This is because a mobile station located near a cell boundary has a longer distance from the base station of the cell in which the cell is located and a greater signal distance attenuation, whereas a mobile station located in a neighboring cell is relatively far from the base station. It is one of the means for preventing the communication quality from deteriorating by utilizing the fact that the distance is short and the signal distance attenuation is small. However, this is for compensating for distance attenuation, and does not follow instantaneous fluctuation.

In direct spread CDMA, multicode transmission is known as a method for transmitting information exceeding the information transmission rate per channel (one spreading code). In this method, a plurality of channels, that is, a plurality of spreading codes are assigned to one user, and the transmitting side divides information data into a plurality of channels, spreads the data, and multiplexes and transmits the data. When performing synchronous detection in this multicode transmission, the pilot symbol or pilot channel may be used. Also, in order to avoid duplication of pilot symbols used in the same communication, the transmitting side periodically interpolates and transmits pilot symbols only to one channel (one spreading code) of the channels to be multiplexed, and transmits pilot symbols to other channels. A scheme has been proposed in which the transmission side does not transmit, but the receiving side estimates the state of the line (transmission path transfer function) from the transmitted pilot symbols and performs synchronous detection of each multiplexed channel based on the state. I have.

FIG. 26 shows a time transition of signals transmitted from a plurality of antennas of a base station when multicode transmission is performed using pilot symbols. This figure shows an example in which the base station has one antenna and communicates with three mobile stations, and mobile station (1) performs multicode transmission using three spreading codes. . In time slot 1, TCH-1a, TCH-1b and TCH-1c are multiplexed and transmitted from antenna A, and TCH-2 and TCH-3 are multiplexed and transmitted from antenna B. In time slot 2, TCH-1a, TCH-1b, TCH-1c, and TCH-2 are multiplexed and transmitted from antenna A,
Antenna B transmits TCH-3. In time slot 3, TCH-1a, TCH-1b, TCH-1c,
TCH-2 and TCH-3 are multiplexed and transmitted, and are not transmitted from antenna B. The pilot symbols for TCH-1a, TCH-1b, and TCH-1c are common.

The information signal addressed to each mobile station is transmitted from the same antenna to the mobile station via the same antenna for both the pilot symbol and the information symbol for each slot.
Line conditions due to fading and the like are equal. Therefore, it is possible to estimate the reference phase and the delay profile using the pilot symbols of each signal.

[0015]

However, the above-mentioned conventional mobile communication system has the following problems. (a) Pilot symbols of many communication channels transmitted from the same base station antenna are multiplexed and interfere with each other. (b) If the number of pilot symbols is increased to improve the communication quality, the transmission efficiency of the information signal decreases. (c) Site diversity increases the desired wave component,
The interference wave component for other mobile stations also increases.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides an excellent mobile communication method and apparatus capable of improving the communication quality by improving the reliability of a pilot signal and thereby increasing the subscriber capacity. About.

[0017]

In order to achieve the above object, the present invention is to transmit a plurality of pilot signals spread from a plurality of antennas of a base station with a unique spreading code assigned to each antenna. Is a common pilot signal of the communication channel transmitted from the same base station antenna, the reliability is improved by reducing the number of multiplexed pilot signals to reduce mutual interference, or spread code By receiving a plurality of pilot symbols different from each other, the reliability can be improved, thereby improving the communication quality of the information signal and increasing the subscriber capacity.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention relates to a mobile communication method for performing communication on a plurality of lines using code division multiple access, wherein the base station includes a plurality of transmission antennas, A signal obtained by spreading a predetermined pilot signal from each antenna with a different spreading code assigned to each antenna and an information signal for each line transmitted from each antenna are assigned to each line, and the pilot signal The mobile station multiplexes a signal spread with a spreading code different from the above spreading code and transmits the multiplexed signal. The mobile station performs RAKE combining on the basis of the pilot signal of the base station antenna to which the information signal of each line is transmitted, and performs synchronous detection. This is a mobile communication method that performs pilot communication by providing a pilot channel signal that is always transmitted separately for each antenna. Improve the reliability of the estimated delay profile due to the phase and the pilot signal, to improve the communication quality of the information signal with, an effect that can increase the subscriber capacity.

According to a second aspect of the present invention, there is provided a mobile communication base station apparatus for communicating a plurality of lines with a mobile station using diversity transmission with a plurality of antennas using code division multiple access. Means for encoding an information signal to be communicated to the apparatus, means for spreading the encoded signal with a spreading code assigned to each line, means for switching an antenna to be transmitted for each line, and assignment for each antenna Mobile communication comprising: means for spreading a pilot signal with a given spreading code, means for multiplexing a spread signal transmitted from each antenna, and means for converting a multiplexed signal transmitted from each antenna into a radio frequency and transmitting the signal. The base station is a base station device. By providing a constantly transmitted pilot channel signal separately for each antenna, Improve the reliability of the estimated delay profile according to improve the communication quality of the information signal with, an effect that can increase the subscriber capacity.

The invention described in claim 3 is the same as the invention described in claim 2.
Means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus described and converting it to a baseband signal,
Means for despreading the received information signal with a spreading code assigned to its own line, means for selecting a spreading code suitable for the received pilot signal, means for despreading the received pilot signal, Means for RAKE combining a signal of a line based on the pilot signal thus obtained,
A mobile communication mobile station device comprising: means for synchronously detecting a combined signal; and means for decoding communication information of a line from the detected signal. A constantly transmitted pilot channel signal is separately provided for each antenna. Accordingly, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal is improved, and thus the communication quality of the information signal is improved, and the subscriber capacity can be increased.

According to a fourth aspect of the present invention, the pilot signal for each antenna of the base station is spread and multiplexed only for symbols at predetermined positions in each slot. 1. When the information signal is transmitted over the entire slot, the number of multiplexed pilot signals increases from the number of mobile stations communicating simultaneously by the number of base station antennas, but the number of pilot symbols increases. Therefore, the reliability of the pilot signal can be improved. In addition, since some symbols do not transmit a pilot signal, interference with the information signal is reduced as compared with the case where the pilot signal is transmitted over the entire slot. Furthermore, since information symbols can be transmitted to a portion where pilot symbols are transmitted by the conventional interpolation type synchronous detection method, it is possible to transmit more information,
By utilizing this for improving the error correction capability or expanding the control information of the communication line, there is an effect that the communication quality can be further improved and the subscriber capacity can be increased.

The invention according to claim 5 is characterized in that the information signal of each line is spread and multiplexed only in a predetermined position of a symbol which does not overlap with a pilot signal in each slot. The mobile communication method according to claim 1 or 4, wherein when the information signal is transmitted over the entire slot, the number of multiplexed pilot signals increases by the number of base station antennas from the number of mobile stations communicating simultaneously. , The number of pilot symbols increases, so that the reliability of the pilot signal can be improved. In addition, since some symbols do not transmit a pilot signal, interference with the information signal is reduced as compared with the case where the pilot signal is transmitted over the entire slot. Furthermore, since information symbols can be transmitted to the part where pilot symbols were transmitted by the conventional interpolation type synchronous detection method, more information can be transmitted, and this is used to improve error correction capability. Or by expanding the control information of the communication line, the communication quality can be further improved and the subscriber capacity can be increased.

According to a sixth aspect of the present invention, there is provided a mobile base station apparatus for communicating a plurality of lines using diversity transmission with a plurality of antennas by using code division multiple access, wherein the information communicated for each line is provided. Means for encoding a signal, means for spreading the encoded signal with a spreading code assigned to each line, means for switching antennas to be transmitted for each line, and a spreading code assigned to each antenna. Means for spreading the pilot signal, means for connecting the spread pilot signal to the next stage at a predetermined position in the slot in symbol units, means for multiplexing the connected spread signal for each antenna, Means for converting a multiplex signal to be transmitted for each antenna into a radio frequency and transmitting the radio signal, and a pilot channel signal which is always transmitted. Providing a separate antenna for each antenna improves the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal, thereby improving the communication quality of the information signal and increasing the subscriber capacity. . In addition, since the information symbol can be transmitted to a portion that was used as a pilot symbol in the conventional interpolation type synchronous detection method, more information can be transmitted to the mobile station, and this can be used for improving error correction capability. By expanding the control information of the communication line, the communication quality can be further improved and the subscriber capacity can be increased.

According to a seventh aspect of the present invention, there is provided a mobile base station apparatus for communicating a plurality of lines using diversity transmission by a plurality of antennas using code division multiple access, Means for encoding a signal, means for spreading the encoded signal with a spreading code assigned to each line, means for switching antennas to be transmitted for each line, and a spreading code assigned to each antenna. Means for spreading the pilot signal, means for connecting the spread information signal to the next stage at a predetermined position in the slot in symbol units, means for multiplexing the connected spread signal for each antenna, Means for converting a multiplexed signal to be transmitted for each antenna into a radio frequency and transmitting the converted radio signal, wherein a pilot channel signal which is always transmitted is un-transmitted. Providing a separate channel for each channel increases the reliability of estimating the reference phase by the pilot signal and the delay profile by the pilot signal, thereby improving the communication quality of the information signal and increasing the subscriber capacity. . In addition, since the information symbol can be transmitted to a portion that was used as a pilot symbol in the conventional interpolation type synchronous detection method, more information can be transmitted to the mobile station, and this can be used for improving error correction capability. By expanding the control information of the communication line, the communication quality can be further improved and the subscriber capacity can be increased.

The invention described in claim 8 is the same as the invention in claim 6.
Or means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to claim 7 and converting it to a baseband signal, and inverting the received information signal with a spreading code assigned to its own line. Means for spreading, means for storing the information signal of the despread line, means for selecting a spreading code suitable for the received pilot signal, means for despreading the received pilot signal, and despread pilot signal Means for estimating the line state from the signal, means for RAKE combining the signal of the line based on the estimated line state,
A mobile communication mobile station device comprising means for synchronously detecting a KE-combined signal and means for decoding line communication information from the detected signal, wherein a constantly transmitted pilot channel signal is separately provided for each antenna. By providing such a configuration, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal is improved, and thus the communication quality of the information signal is improved, and the subscriber capacity can be increased. In addition, since the base station side can transmit information symbols also to the parts that were used as pilot symbols in the conventional interpolation type synchronous detection method, more information can be received by the mobile station side, and this can be corrected by error correction. By using the information to improve the communication quality or expanding the control information of the communication line, the communication quality can be further improved and the subscriber capacity can be increased.

According to a ninth aspect of the present invention, an instruction of a base station antenna for transmitting a downlink is transmitted from the mobile station to the base station through the uplink.
Alternatively, the mobile communication method according to claim 4 or 5, wherein the mobile station selects a transmission antenna of the base station and instructs the base station on the uplink so that the reference phase based on the pilot signal or the pilot signal is used. The reliability of the delay profile estimation is improved, and the communication quality of the information signal is improved.In addition, since information for identifying the base station antenna that has transmitted the information signal is transmitted on the uplink, the transmission efficiency of the downlink is not reduced. Has the effect of increasing the subscriber capacity.

According to a tenth aspect of the present invention, an instruction of a base station antenna for transmitting a downlink is transmitted from the base station to the mobile station based on a position of a symbol which does not transmit a downlink information signal. 6. The mobile communication method according to claim 5, wherein the mobile station is instructed to specify the transmission antenna of the base station by the position of the symbol that does not transmit the downlink information signal, so that the mobile station can use more pilots. Signals can be received, and pilot symbols with less interference can be received, and the reliability of the estimation of the reference phase and the delay profile by the pilot signal by the pilot signal is improved, thereby improving the communication quality of the information signal. To transmit information for identifying the base station antenna that transmitted the information signal on the downlink, By reducing the control delay, an effect that can increase the subscriber capacity.

Further, according to the present invention, in a base station, information for specifying a transmission antenna among information signals of a downlink is differentially encoded and transmitted, and a mobile station transmits
5. The transmission antenna of a base station is identified by delay-detecting the information.
Alternatively, in the mobile communication method according to claim 5, the transmission antenna of the base station is specified by differentially encoding a part of the downlink information signal and transmitted to the mobile station. It is possible to receive many pilot signals and receive pilot symbols with little interference, improve the reliability of estimating the reference phase by pilot signals and the delay profile by pilot signals, and thereby improve the communication quality of information signals. In addition, since information for identifying the base station antenna that transmitted the information signal is transmitted on the downlink, there is an effect that the delay of the selection control of the transmission antenna can be reduced and the subscriber capacity can be increased. .

According to a twelfth aspect of the present invention, a mobile base station apparatus for communicating a plurality of lines using code division multiple access using diversity transmission by a plurality of antennas communicates for each line. Means for encoding the information signal, means for differentially encoding a part of the information signal encoded for each line, and means for spreading the encoded signal with a spreading code assigned to each line Means for switching an antenna to be transmitted for each line, means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing a spread signal transmitted from each antenna, and multiplexing for transmission from each antenna. Means for converting a signal into a radio frequency and transmitting the signal, the identification of a transmission antenna of the base station, the identification of a part of the downlink information signal by a differential code By transmitting to the mobile station to,
The mobile station receives more pilot signals,
It is possible to receive a pilot symbol with little interference, improve the reliability of estimating the reference phase by the pilot signal and the delay profile by the pilot signal, thereby improving the communication quality of the information signal, and the base station that transmitted the information signal. Since the information for specifying the station antenna is transmitted on the downlink, there is an effect that the delay in the selection control of the transmission antenna can be reduced and the subscriber capacity can be increased.

According to a thirteenth aspect of the present invention, there is provided means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to the twelfth aspect and converting the signal into a baseband signal; Means for despreading a signal with a spreading code assigned to its own line, means for storing an information signal of the despread line, means for selecting a spreading code suitable for a received pilot signal, Means for despreading the signal, means for estimating the line condition from the despread pilot signal, means for RAKE combining the signal of the line based on the estimated line condition, and a part of the RAKE-combined information signal Means for delay-detecting, and transmitting to a means for selecting a spreading code for despreading the pilot signal;
A mobile communication mobile station device comprising: means for synchronously detecting a rake-combined signal; and means for decoding communication information of a line from the detected signal, wherein an information signal for specifying a transmission antenna from a base station is provided. Is received by the mobile station, the mobile station can receive more pilot signals and receive pilot symbols with less interference. This has the effect of increasing the reliability of estimating the delay profile based on the reference phase and the pilot signal, thereby improving the communication quality of the information signal.

According to a fourteenth aspect of the present invention, a base station performs error detection coding on a downlink information signal, and a mobile station performs temporary decoding of an information signal based on a pilot signal of each antenna of the base station. The method according to claim 1 or 2, wherein the base station estimates from which antenna the signal has been transmitted from the temporary decoding result, and sets the temporary decoding result based on a pilot signal in which no error is detected as a decoding result. 4
Or, in the mobile communication method according to claim 5, in addition to the operation of each of the claims, since information for specifying the base station antenna that transmitted the information signal is not transmitted from the base station or the mobile station, This has the effect that the subscriber capacity can be increased without lowering the transmission efficiency of the downlink and uplink.

According to a fifteenth aspect of the present invention, in a mobile communication base station apparatus for communicating a plurality of lines using diversity transmission by a plurality of antennas using code division multiple access, communication is performed for each line. Means for encoding the information signal, means for further error detection encoding the information signal encoded for each line, and means for spreading the error detection encoded signal with a spreading code assigned to each line Means for switching antennas to be transmitted for each line, means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing spread signals transmitted from each antenna, and transmission from each antenna Means for converting a multiplexed signal into a radio frequency and transmitting the radio signal. The mobile communication base station apparatus includes: The base station antenna that transmitted the information signal can be specified without transmitting information for identifying the received base station antenna on the downlink, and the subscriber capacity can be increased without reducing the transmission efficiency of the downlink. It has the effect of being able to.

According to a sixteenth aspect of the present invention, there is provided means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to the fifteenth aspect and converting the signal into a baseband signal, and a received information signal. Means for despreading with a spreading code assigned to the line of the own station, means for storing an information signal of the despread line, means for despreading a pilot signal corresponding to each antenna of the base station, and despreading. Means for storing the extracted pilot signal, means for selecting one of the despread pilot signals, means for estimating the line condition from the selected pilot signal, and RAKE combining of the line signal based on the estimated line condition. Means for synchronously detecting the RAKE-combined signal, and provisionally decoding line communication information from the detected signal to determine whether an error has been detected. A mobile unit comprising: an error detection decoding unit that transmits a despread pilot signal to a unit that selects a despread pilot signal so as to select another pilot signal; and a unit that decodes communication information in which no error is detected. A communication mobile station device, wherein the base station transmits an information signal without transmitting information for identifying a base station antenna to which an information signal has been transmitted by providing the mobile station with an error detection function. The antenna can be specified, and the subscriber capacity can be increased without lowering the transmission efficiency of the uplink.

According to a seventeenth aspect of the present invention, a base station performs error correction coding on a downlink information signal, and a mobile station performs error correction decoding of an information signal based on a pilot signal of each antenna of the base station. The mobile communication method according to claim 1 or claim 4 or claim 5, wherein the antenna is transmitted from which antenna of the base station. Since information for identifying the base station antenna that transmitted the information signal is not transmitted from the base station or the mobile station, it is possible to increase the subscriber capacity without lowering the transmission efficiency of the downlink and uplink. Has an action.

In the mobile communication base station apparatus for communicating a plurality of lines using diversity transmission with a plurality of antennas using code division multiple access, the invention according to claim 18 performs communication for each line. Means for encoding the information signal, means for further error-correcting the information signal encoded for each line, and means for spreading the error-corrected encoded signal with a spreading code assigned to each line Means for switching an antenna to be transmitted for each line, means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing a spread signal transmitted from each antenna, and multiplexing for transmission from each antenna. A mobile communication base station device having means for converting a signal to a radio frequency and transmitting the signal. The base station has an error correction function to transmit an information signal. The base station antenna that transmitted the information signal without transmitting information for identifying the specified base station antenna on the downlink, and increasing the subscriber capacity without lowering the transmission efficiency of the downlink. It has the effect of being able to.

According to a nineteenth aspect of the present invention, there is provided means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to the eighteenth aspect and converting the signal into a baseband signal, and a received information signal. Means for despreading with a spreading code assigned to the line of its own station, means for storing information signals of the despread line, means for despreading pilot signals corresponding to a plurality of antennas of the base station, Means for estimating the line state from each despread pilot signal;
Means for RAKE-combining the line information signals based on the respectively estimated line state, means for synchronously detecting each RAKE-combined information signal, and error detection of the line communication information using the plurality of detected information signals. A mobile communication mobile station device comprising: a means for correcting and decoding; and a means for decoding an error-corrected decoded signal. By providing the mobile station with an error-correcting function, the base station antenna from which the information signal was transmitted can be used. It is possible to specify the base station antenna that transmitted the information signal without transmitting information for identification on the uplink, which has the effect of increasing the subscriber capacity without reducing the transmission efficiency of the uplink. .

According to a twentieth aspect of the present invention, the down-link section is reduced and the up-link section is expanded using a time division duplex system. A mobile communication method according to claim 5, claim 9, or claim 10, or claim 11, or claim 14, or claim 17. In addition to the operation of each of the claims, a downlink pilot section is reduced, and By expanding the pilot symbol section of the line, the subscriber capacity can be further increased.

The invention according to claim 21 is characterized in that the downlink section is reduced and the uplink section is expanded by using a time division duplex system. A mobile communication base station apparatus according to claim 7, or claim 12, or claim 15, or claim 18. In addition to the effect of each of the claims, the pilot section on the uplink is reduced by reducing the pilot section on the downlink. The expansion has the effect that the subscriber capacity can be further increased.

According to a twenty-second aspect of the present invention, the down-link section is reduced and the up-link section is expanded using a time division duplex system. 13. The mobile communication mobile station device according to claim 13 or claim 16 or claim 19, wherein in addition to the effects of these claims, the downlink pilot section is reduced and the uplink pilot symbol section is expanded. Has the effect that the subscriber capacity can be further increased.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 shows a time change of a signal multiplexed and transmitted from a plurality of antennas of a base station at a certain time in Embodiment 1 corresponding to claim 1 of the present invention. This diagram shows an example in which the base station as shown in FIG. 22 has two antennas and simultaneously communicates with five mobile stations. A time slot is composed of a plurality of symbols, and a frame is composed of a plurality of time slots. A pilot channel 1 (hereinafter referred to as PCH-1), which is a base signal, is transmitted from antenna A in any slot, and a base station signal is spread from antenna B in any slot by a spreading code different from PCH-1. A pilot channel 2 (hereinafter referred to as PCH-2), which is a signal, is being transmitted. The base station estimates the state of the line between the mobile station (1) and each of the antennas, and obtains a signal (hereinafter, referred to as the mobile station (1)).
TCH-1) from one of the antennas with good line conditions. Signal addressed to mobile station (2) (hereinafter referred to as TCH-2), signal addressed to mobile station (3) (hereinafter referred to as TCH-3), signal addressed to mobile station (4) (hereinafter referred to as TCH-4) , Mobile station (5)
The same applies to the destination signal (hereinafter referred to as TCH-5). Signals for each mobile station, TCH-1, TCH-2, TCH-3, TC
The antenna for transmitting H-4 and TCH-5 is determined for each time slot or for some slots.

In FIG. 1, in time slot 1, PCH-1, TCH-1, TCH-2, and TCH-3 are multiplexed and transmitted from antenna A, and PCH-2, TCH- 4, TC
H-5 is multiplexed and transmitted. In time slot 2,
From antenna A, PCH-1, TCH-2, and TCH-3 are multiplexed and transmitted, and from antenna B, PCH-2, TCH-1, TCH-4, and TCH-3 are transmitted.
CH-5 is multiplexed and transmitted. In time slot 2, PCH-1 and TCH-3 are multiplexed and transmitted from antenna A, and PCH-2, TCH-1, TCH-2 and TCH-4 are transmitted from antenna B.
, TCH-5 are multiplexed and transmitted.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. As a result, in the mobile station,
A pilot signal (in this case, PCH-1 or PCH-2) can be received at any symbol in the slot.

If the pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Further, a signal addressed to each mobile station is transmitted from only one of the antennas A and B, and an antenna having a good line condition with each mobile station is selected as an antenna to be transmitted. Upon reception at the station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state.

As described above, according to Embodiment 1 of the present invention, a pilot channel signal that is constantly transmitted is separately provided for each antenna, so that a reference phase based on pilot signals and a delay profile based on pilot signals can be estimated. Reliability can be improved and communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention.
15 shows a configuration of a mobile communication base station apparatus according to Embodiment 2 corresponding to FIG. This figure shows an example in which two antennas simultaneously communicate with three mobile stations. In FIG. 2, 0201
Is the communication line coding means for the mobile station (1), 0202 is the communication line coding means for the mobile station (2), and 0203 is the mobile station.
(3) means for encoding a communication line. Reference numeral 0204 denotes spreading means for spreading with the spreading code 1 assigned to the mobile station (1), 0205 denotes spreading means for spreading with the spreading code 2 assigned to the mobile station (2), and 0206 denotes a spreading means assigned to the mobile station (3). This is a spreading means for spreading with the spreading code 3. 0207 is a mobile station (1)
Switching means for switching to an antenna for transmitting a destination signal,
Reference numeral 0208 denotes switching means for switching to an antenna for transmitting a signal addressed to the mobile station (2), and reference numeral 0209 denotes switching means for switching to an antenna for transmitting a signal addressed to the mobile station (3). Numeral 0210 is a selecting means for selecting an antenna for transmitting a signal addressed to each mobile station. Numeral 0211 denotes a spreading means for spreading the pilot signal with the spreading code 4 assigned to the antenna A, and numeral 0212 denotes a spreading means for spreading the pilot signal with the spreading code 5 assigned to the antenna B. [0213] Reference numeral 0213 denotes a multiplexing unit that multiplexes a signal transmitted from the antenna A, and 0214 denotes a multiplexing unit that multiplexes a signal transmitted from the antenna B. [0215] Reference numeral 0215 denotes frequency conversion means for converting a signal transmitted from the antenna A to a radio frequency and amplifying the signal, and reference numeral 0216 denotes frequency conversion means for converting a signal transmitted from the antenna B to a radio frequency and amplifying the signal. 0217 is an antenna A, and 0218 is an antenna B.

The operation of the mobile communication base station apparatus configured as described above will be described below. Audio information, image information and the like applied to the mobile station (1) are encoded by the encoding means 0201. The signal band of the coded signal is spread by spreading means 0204 with spreading code 1 assigned to mobile station (1). The spread signal is supplied to the multiplexing unit 0213 or 02
Connected to 14. Mobile station (2) Information and mobile station
(3) The same applies to the information addressed. The selecting means 0210 selects an antenna for transmitting a signal of each line according to the reception state of each line of the uplink and the decoded control information, and
Instruct 7, 0208 or 0209. The choice of antenna is 1
This is repeated for one or more slots.

The pilot signal of antenna A is supplied to a spreading means.
In 0211, the signal band is spread with the spreading code 4 assigned to the antenna A. The spread pilot signal is
The signal is multiplexed in the multiplexing unit 0213 together with the spread signal of another line transmitted from the antenna A. The multiplexed spread signal is band-converted to a radio frequency by the frequency conversion unit 0215, amplified, and transmitted from the antenna A to the mobile station in the cell. The same applies to antenna B.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. As a result, in the mobile station,
Always a pilot signal (in this case, PCH-1 or PCH-2)
Can be received.

If a pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Further, a signal addressed to each mobile station is transmitted from only one of the antennas A and B, and an antenna having a good line condition with each mobile station is selected as an antenna to be transmitted. Upon reception at the station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state.

As described above, according to the second embodiment of the present invention, a pilot channel signal that is constantly transmitted is separately provided for each antenna, so that a reference phase based on pilot signals and a delay profile based on pilot signals can be estimated. Reliability can be improved and communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

In the present embodiment, the encoding in the encoding means is audio encoding, image encoding, or the like, but may be further subjected to error detection encoding, error correction encoding, or the like. In that case, the mobile station performs error detection and error correction decoding accordingly.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention.
15 shows a configuration of a mobile communication mobile station apparatus according to Embodiment 3 corresponding to FIG. This figure shows an example in which the base station has two antennas. In FIG. 3, reference numeral 0301 denotes an antenna for receiving a radio signal. Reference numeral 0302 denotes frequency conversion means for amplifying a signal received by the antenna 0301 and converting the signal from a radio frequency to a baseband frequency. [0303] Reference numeral 3033 denotes a despreading means for a pilot signal for detecting a correlation value of the pilot signal using a spreading code assigned to each antenna of the base station. 0304
Is switching means for switching the spreading code used in the despreading of the pilot signal. Reference numeral 0305 denotes an information signal despreading unit that detects a correlation value of the information signal using a spreading code assigned to its own mobile station. Reference numeral 0306 denotes RAKE combining means for performing RAKE combining of the correlation value of the information signal based on the correlation value of the pilot signal. Reference numeral 0307 denotes synchronous detection means for performing synchronous detection. [0308] Decoding means for reproducing information such as audio information and image information from the detected signal.

The operation of the mobile communication mobile station configured as described above will be described below. Antenna 0301
The signal of the radio frequency received at is amplified by the frequency conversion means 0302 and then band-converted to the baseband frequency. This signal is split into two signals,
It is conveyed to 0303 and 0305. Despreading means 0303 for the pilot signal despreads using the spreading code switched and connected in switching means 0304 to detect the correlation value of the pilot signal, and transmits it to RAKE combining means 0306. Switching means 0304
Connects the spreading code assigned to the antenna of the base station to which the signal has been transmitted to the despreading means 0303. On the other hand, the spreading means 0305 for the information signal detects the correlation value of the information signal by performing despreading using the spreading code assigned to its own mobile station, and transmits it to the RAKE combining means 0306. RAKE combining means 0306
Then, the channel state is estimated based on the correlation value of the pilot signal, and the correlation value of the information signal is RAKE-combined to perform synchronous detection
Tell 07. In the synchronous detection means 0307, the information signal subjected to RAKE synthesis is synchronously detected and transmitted to the decoding means 0308. Decryption means
[0308] At 0308, the base station decodes the detected signal and reproduces information transmitted from the base station, such as audio information and image information.

In the base station, pilot signal PCH-1 is transmitted from antenna A, and pilot signal PCH-
Sending 2. These are spread with spread signals assigned to the respective antennas. The information signal from the base station to each mobile station selects an antenna having a good line condition and is transmitted from one of the antennas, and these are spread by the spread signal assigned to each mobile station. .

Signals transmitted from the same antenna of the base station reach the mobile station via the same path, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. As a result, in the mobile station,
Always a pilot signal (in this case, PCH-1 or PCH-2)
Can be received.

If a pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Further, a signal addressed to each mobile station is transmitted from only one of the antennas A and B, and an antenna having a good line condition with each mobile station is selected as an antenna to be transmitted. Upon reception at the station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state.

As described above, according to the third embodiment of the present invention, a pilot channel signal that is constantly transmitted is separately provided for each antenna, so that a reference phase based on a pilot signal and a delay profile based on a pilot signal can be estimated. Reliability can be improved and communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

In the third embodiment, the decoding by the decoding means is decoding of voice or image. However, if the base station performs error detection coding or error correction coding, the mobile station may perform the decoding. On the side, error detection decoding and error correction decoding are further performed accordingly.

(Embodiment 4) FIG. 4 shows a fourth embodiment of the present invention.
FIG. 18 shows a slot symbol configuration of a pilot channel in the mobile communication method according to the fourth embodiment corresponding to claim 5. This figure shows an example in which only the first few symbols and the last few symbols of the whole slot are transmitted, and other symbols between them are not transmitted. 0401 and 0402 are predetermined pilot symbols, and 0403 is a NULL symbol that does not transmit anything. Such a slot configuration is equivalent to transmitting a pilot channel only to a pilot symbol portion in the slot configuration of the conventional pilot interpolation type synchronous detection scheme shown in FIG.

FIG. 5 shows a slot symbol configuration of an information channel according to the fourth embodiment. As shown in FIG.
When the information signal is transmitted only to the information symbol portion in the slot configuration of the conventional interpolation type synchronous detection scheme, the information signal and the pilot signal do not overlap. 0501 and 0502 are NULL symbols that do not transmit anything, and 0503 is an information symbol. Therefore, the number of multiplexed pilot signals is reduced from the number of mobile stations communicating simultaneously to the number of antennas of the base station. Assuming a communication system in which the number of mobile stations communicating at the same time is about 10 to 20 times the number of antennas of the base station, the effect of reducing the number of multiplexes is obvious. Since the interference component to the pilot signal is greatly reduced, the reliability is greatly improved. Further, since the signal does not overlap with the information signal, even if the transmission power of the pilot channel is larger than the transmission power of the information signal, the number of multiplexed information signals is the same as in the related art, so that interference with the information signal does not increase. Increasing the transmission power of the pilot channel increases the reliability of the pilot signal. As a result, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal can be improved, and the communication quality can be improved.

When the information signal is transmitted not only to the information symbol part but also to the pilot symbol part in the slot structure of the conventional interpolation type synchronous detection system, the number of multiplexed pilot signals is determined by the number of mobile stations communicating simultaneously. Only by the number of base station antennas. in this case,
Since information symbols can be transmitted to a portion where a pilot symbol has been conventionally transmitted, more information can be transmitted. By using this to improve the error correction capability, or by expanding the control information of the communication line,
Communication quality can be further improved.

FIG. 6 shows another slot symbol configuration of the pilot channel in the fourth embodiment. This figure shows an example in which a pilot signal is transmitted or not transmitted every several symbols in the entire slot. 0601,060
2, 0603, 0604, 0605, 0606, 0607 are predetermined pilot symbols, and 0608, 0609, 0610,
0611, 0612, and 0613 are NULL symbols that do not transmit anything.

As described above, according to the fourth embodiment of the present invention, the information signal is slotted by spreading and multiplexing the pilot signal and the information signal only for the symbol at a predetermined position in each slot. When transmitted over the whole, the number of multiplexed pilot signals increases by the number of base station antennas from the number of mobile stations communicating simultaneously,
Since the number of pilot symbols increases, the reliability of the pilot signal can be improved. In addition, since some symbols do not transmit a pilot signal, interference with the information signal is reduced as compared with the case where the pilot signal is transmitted over the entire slot. Furthermore, since information symbols can be transmitted to the part where pilot symbols were transmitted by the conventional interpolation type synchronous detection method, more information can be transmitted, and this is used to improve error correction capability. Or by expanding the control information of the communication line,
Further, communication quality can be improved. In communication using code division multiple access, there is an effect that improvement in communication quality enables an increase in subscriber capacity.

(Embodiment 5) FIG. 7 shows a sixth embodiment of the present invention.
15 shows a configuration of a mobile communication base station apparatus according to a fifth embodiment corresponding to claim 7. This figure shows an example in which two antennas simultaneously communicate with three mobile stations. FIG.
, 0701 is a communication line coding means for the mobile station (1), 0702 is a communication line coding means for the mobile station (2), and 0703 is a communication line code for the mobile station (3). Means. Reference numeral 0704 denotes spreading means for spreading with the spreading code 1 assigned to the mobile station (1), 0705 denotes spreading means for spreading with the spreading code 2 assigned to the mobile station (2), and 0706 denotes a spreading means assigned to the mobile station (3). This is a spreading means for spreading with the spreading code 3. 07
07 is a switching means for switching to an antenna for transmitting a signal to the mobile station (1), 0708 is a switching means for switching to an antenna for transmitting a signal to the mobile station (2), and 0709 is a signal for transmitting to the mobile station (3). This is switching means for switching to an antenna to be changed. Reference numeral 0710 denotes a selection unit for selecting an antenna for transmitting a signal addressed to each mobile station. Reference numeral 0711 denotes a spreading unit that spreads a pilot signal using the spreading code 4 assigned to the antenna A, and 0712 denotes a spreading unit that spreads a pilot signal using the spreading code 5 assigned to the antenna B. Reference numeral 0719 denotes connection means for connecting a spread signal of the pilot signal of the antenna A, and 0720 denotes connection means for connecting a spread signal of the pilot signal of the antenna B. Reference numeral 0721 denotes connection means for connecting a spread signal of an information signal transmitted from the antenna A, and reference numeral 0722 denotes connection means for connection of a spread signal of an information signal transmitted from the antenna B. 0713 is a multiplexing unit for multiplexing a signal transmitted from the antenna A, and 0714 is a multiplexing unit for multiplexing a signal transmitted from the antenna B. Reference numeral 0715 denotes frequency conversion means for converting a signal transmitted from the antenna A to a radio frequency and amplifying the signal, and reference numeral 0716 denotes frequency conversion means for converting a signal transmitted from the antenna B to a radio frequency and amplifying the signal. Reference numeral 0717 denotes an antenna A, and 0718 denotes an antenna B.

The operation of the mobile communication base station apparatus configured as described above will be described below. Audio information, image information, and the like applied to the mobile station (1) are encoded by the encoding means 0701. The coded signal is supplied to the spreading means 0704
In, the signal band is spread with the spreading code 1 assigned to the mobile station (1). The spread signal is connected to the connecting means 0721 or 0722 in the switching means 0707 according to the instruction of the selecting means 0710. The same applies to the information addressed to the mobile station (2) and the information addressed to the mobile station (3). The selecting means 0710 selects an antenna for transmitting a signal of each line according to the reception state of each line of the uplink and the decoded control information, and
Instruct 07, 0708 or 0709. The choice of antenna is 1
This is repeated for one or more slots. The signal band of the pilot signal of antenna A is spread by spreading code 011 assigned to antenna A by spreading means 0711. The spread pilot signal is connected by connecting means 0719 to multiplexing means 0713 by a symbol at a predetermined position in the slot. The spread information signal transmitted from the antenna A is connected to the multiplexing unit 0713 in the connecting unit 0721 by a symbol at a predetermined position in the slot. The spread signal connected to the multiplexing unit 0713 is multiplexed, band-converted to a radio frequency by the frequency conversion unit 0715, and then amplified and
It is transmitted from 0717 to mobile stations in the cell. The same applies to antenna B.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Thereby, for example, it becomes possible to transmit a pilot signal in the slot configuration shown in FIG. 4 and transmit an information signal in the slot configuration shown in FIG. In this case, since the pilot signal and the information signal do not overlap, the interference of the pilot signal in reception at the mobile station is reduced. The pilot signal can also be transmitted with a large amount of power as the number of multiplexes is reduced. Also,
A signal addressed to each mobile station is transmitted from only one of the antennas A and B, and an antenna to be transmitted is selected from antennas having good line conditions with each mobile station. , The component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. Further, the switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state.

As described above, according to the fifth embodiment of the present invention, by providing a pilot channel signal that is constantly transmitted separately for each antenna, it is possible to estimate the reference phase by the pilot signal and the delay profile by the pilot signal. Reliability can be improved and communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity. Further, by multiplexing the pilot signal and the information signal only with respect to the symbol at a predetermined position in the slot, the information symbol can be transmitted also to the portion used as the pilot symbol in the conventional interpolation type synchronous detection method, so that Much information can be transmitted to mobile stations. The communication quality can be further improved by utilizing this to improve the error correction capability or expanding the control information of the communication line.

In the fifth embodiment, the encoding in the encoding means is audio encoding, image encoding, or the like, but may be error detection encoding, error correction encoding, or the like. In that case, the mobile station side further performs error detection decoding and error correction decoding accordingly.

(Embodiment 6) FIG. 8 shows an embodiment 8 of the present invention.
15 shows a configuration of a mobile communication mobile station apparatus according to Embodiment 6 corresponding to FIG. This figure shows an example in which the base station has two antennas. In FIG. 8, reference numeral 0801 denotes an antenna for receiving a radio signal. Reference numeral 0802 denotes frequency conversion means for amplifying a signal received by the antenna 0801 and converting the signal from a radio frequency to a baseband frequency. Reference numeral 0803 denotes a despreading unit that detects a correlation value of a pilot signal using a spreading code assigned to each antenna of the base station. Reference numeral 0804 denotes switching means for switching a spreading code used in despreading of a pilot signal.
Reference numeral 0805 denotes a despreading unit that detects a correlation value of an information signal using a spreading code assigned to a mobile station. Reference numeral 0809 denotes an estimating means for estimating the state of the transmission path from the detected correlation value of the pilot signal. Reference numeral 0810 denotes a storage unit that stores a correlation value of the detected information signal. [0806] RAKE combining means for performing RAKE combining of the correlation value of the information signal based on the correlation value of the pilot signal. Reference numeral 0807 denotes a detection unit that performs synchronous detection. 0808
Is decoding means for reproducing information such as audio information and image information from the detected signal.

The operation of the mobile communication mobile station apparatus configured as described above will be described below. Antenna 0801
The signal of the radio frequency received in is amplified by the frequency conversion means 0802 and then band-converted to the baseband frequency. This signal is split into two signals,
Communicated to 0803 and 0805. The despreading means 0803 for the pilot signal despreads using the spreading code switched and connected by the switching means 0804, detects the correlation value of the pilot signal, and transmits it to the estimating means 0809. Switching means 0804 connects the spreading code assigned to the antenna of the base station to which the signal has been transmitted to despreading means 0803. The estimating means 0809 averages the correlation values of the detected pilot signals and performs other processing to estimate the state of the transmission path of the line, and
Tell 0806. On the other hand, despreading means 0805 for information signals
Then, the spread value is despread using the spreading code assigned to the mobile station, and the correlation value of the information signal is detected and transmitted to the storage means 0810. The storage unit 0810 stores the correlation value of the detected information signal and transmits it to the RAKE combining unit 0806. RAKE synthesis means 08
In 06, the correlation value of the information signal is RAKE-combined based on the transmission path state estimated by the estimating means 0809, and the synchronous detection means 0807
Tell The synchronous detection means 0807 synchronously detects the information signal RAKE-combined, and transmits the information signal to the decoding means 0808. Decoding means 08
08 reproduces information transmitted from the base station, such as audio information and image information, by decoding the detected signal.

In the base station, pilot signal PCH-1 is transmitted from antenna A, and pilot signal PCH-
Sending 2. These are spread with spread signals assigned to the respective antennas. The information signal from the base station to each mobile station selects an antenna having a good line condition and is transmitted from one of the antennas, and these are spread by the spread signal assigned to each mobile station. .

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Thus, for example, it becomes possible to transmit a pilot signal in the slot configuration shown in FIG. 4 and transmit an information signal in the slot configuration shown in FIG. In this case, since the pilot signal and the information signal do not overlap, the interference of the pilot signal in reception at the mobile station is reduced. The pilot signal can also be transmitted with a large amount of power as the number of multiplexes is reduced. Also,
A signal addressed to each mobile station is transmitted only from one of the antennas A and B, and an antenna to be transmitted is selected from antennas having good line conditions with each mobile station. Upon reception, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. Further, the switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state.

As described above, according to the sixth embodiment of the present invention, a pilot channel signal that is constantly transmitted is separately provided for each antenna, so that a reference phase based on a pilot signal and a delay profile based on a pilot signal can be estimated. Reliability can be improved and communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity. On the base station side, the pilot signal and the information signal are multiplexed only for the symbol at a predetermined position in the slot, so that the information symbol is also used for the pilot symbol in the conventional interpolation type synchronous detection method. Since transmission is possible, more information can be received on the mobile station side. The communication quality can be further improved by utilizing this to improve the error correction capability or expanding the control information of the communication line.

In the sixth embodiment, the decoding performed by the decoding means is the decoding of voice or image. On the mobile station side, error detection decoding and error correction decoding are further performed accordingly.

(Embodiment 7) FIG. 9 shows a ninth embodiment of the present invention.
FIG. 21 is a diagram schematically illustrating a line between a mobile station and a base station in a mobile communication method according to a seventh embodiment corresponding to FIG. This figure is an example in which the number of antennas of the base station is two. In FIG. 9, reference numeral 0901 denotes a base station, which includes an antenna, a radio unit, a modem unit, a codec unit, and the like. 0902 is antenna A,
Reference numeral 0903 denotes an antenna B for transmitting a downlink radio signal and receiving an uplink radio signal. Reference numeral 0904 denotes a mobile station, which includes an antenna, a radio unit, a modem unit, a codec unit, and the like.

The base station transmits a pilot signal from antenna A
PCH-1 is transmitted, and pilot signal PCH-2 is transmitted from antenna B.
Has been sent. These are spread with spread signals assigned to the respective antennas. The information signal TCH from the base station to each mobile station selects an antenna with a good line condition, is transmitted from one of the antennas, and these are spread by a spread signal assigned to each mobile station. .

[0077] The mobile station receives the downlink from the base station. Both the pilot signal PCH-1 from the antenna A and the pilot signal PCH-2 from the antenna B are received, and the state of the downlink transmission path is estimated. Then, one of the antennas having a better line condition is selected and transmitted to the base station on the uplink to the base station. The base station transmits an information signal TCH addressed to the mobile station from an antenna designated by each mobile station on the uplink. As a result, the mobile station always receives a pilot signal (in this case, PCH-1 or PCH-
2) Be able to receive.

If a pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Further, a signal addressed to each mobile station is transmitted from only one of the antennas A and B, and an antenna having a good line condition with each mobile station is selected as an antenna to be transmitted. Upon reception at the station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state.

In this embodiment, the mobile station itself determines which antenna of the base station has transmitted the information signal addressed to itself, and instructs the base station on the uplink. . Since this is transmitted on the uplink, the information transmission efficiency of the downlink is not reduced. In many base station transmission / reception diversity systems, the transmission diversity effect is smaller than the reception diversity effect, so that the subscriber capacity is limited on the downlink. Therefore, it is preferable that the control signal is transmitted on the uplink rather than transmitted on the downlink, and by transmitting the control signal for selecting the transmission antenna on the uplink, the control information on the downlink does not increase. The communication quality of the downlink does not decrease.

As described above, according to Embodiment 7 of the present invention, the mobile station selects the transmitting antenna of the base station, and instructs the base station on the uplink to transmit the reference phase or pilot signal by the pilot signal. The reliability of estimation of a delay profile by a signal can be improved, and communication quality can be improved. In communication using code division multiple access, there is an effect that improvement in communication quality enables an increase in subscriber capacity. Further, since information for identifying the base station antenna that has transmitted the information signal is transmitted on the uplink, it is possible to increase the subscriber capacity without reducing the transmission efficiency on the downlink.

(Embodiment 8) FIG. 10 is a diagram showing a slot configuration of pilot signals and information signals in a mobile communication method according to Embodiment 8 of the present invention. This figure is an example in which the number of antennas of the base station is two. In FIG. 10, PCH indicates a slot configuration of a pilot signal,
1001 is a pilot symbol (PL), and all PCHs are composed of pilot symbols. TCH-A indicates a slot configuration of a mobile station information signal transmitted from antenna A, and TCH-B indicates a slot configuration of a mobile station information signal transmitted from antenna B. 1002 and 1003 and 1006 and 1007
Is a NULL symbol (NULL) not to be transmitted, and 1004 and 1005 and 1008 and 1009 are information symbols (INFO).

FIG. 11 is a diagram illustrating another pilot signal and information signal slot configuration in the mobile communication method according to the eighth embodiment. This figure is also an example in which the base station has two antennas. In FIG. 11, PCH indicates a slot configuration of a pilot signal, 1101 and 1102 are predetermined pilot symbols (PL), and 1103 is a NULL symbol that does not transmit anything. TCH-A indicates a slot configuration of a mobile station information signal transmitted from antenna A, and TCH-B indicates a slot configuration of a mobile station information signal transmitted from antenna B. 11
04 and 1109 are information symbols (INFO), 1105 and 1106 and 1110 and 1111 are dummy symbols (DMY), 1107 and 11
08, 1112 and 1113 are NULL symbols (NULL) not to be transmitted.

The base station transmits a pilot signal from antenna A
PCH-1 is transmitted, and pilot signal PCH-2 is transmitted from antenna B.
Has been sent. These are spread with spread signals assigned to the respective antennas. An information signal from the base station to each mobile station selects an antenna having a good line condition, and is transmitted from one of the antennas.
The mobile station is spread with a spread signal assigned to each mobile station.

[0084] The base station receives the uplink from the mobile station. From the signal received by antenna A and the signal received by antenna B, the state of the uplink transmission path is estimated. Then, one of the antennas having a better line condition is selected. The mobile station information signal transmitted from antenna A is TC
The mobile station information signal transmitted from the antenna A and transmitted from the antenna B as the HA slot configuration is transmitted from the antenna B as the TCH-B slot configuration. The mobile station receives the information signal transmitted from the base station and determines whether the slot configuration is TCH-A or TCH-B.

In the case of the slot configuration shown in FIG. 10, focusing on the first several symbols and the last several symbols of the slot,
By determining the position of LL, it is possible to determine whether it is TCH-A or TCH-B. Although FIG. 10 divides the NULL position into the beginning and end of the slot, this may be concentrated at the beginning. If it is concentrated first, the transmitted base station antenna can be identified with only the first few symbols.
1 or PCH-2 transmitted from antenna 2 only needs to be received. On the other hand, if the reception state of the first few symbols of the slot is poor due to fading, the transmitted base station The possibility of incorrectly specifying the antenna increases. On the other hand, if the positions of NULLs are dispersed, the danger can be reduced.

In the case of the slot configuration shown in FIG. 11, NULL is focused on the first and last symbols of the slot.
By determining the position of, it is possible to determine whether it is TCH-A or TCH-B. Although FIG. 11 divides NULL positions into the beginning and end of a slot, this may be concentrated at the beginning, as in the case of the slot configuration in FIG. FIG.
The slot configuration of 1 is equivalent to transmitting DMY in a part of the pilot symbol section in the slot configurations of FIGS. Also, by transmitting DMY with power smaller than INFO so that the difference from NULL can be understood,
The antenna of the transmitting base station can be specified while suppressing the interference to the PL. The accuracy of the determination can be increased by controlling the phase of DMY.

The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to Embodiment 8 of the present invention, the mobile station is instructed to specify the transmission antenna of the base station by the position of the symbol which does not transmit the downlink information signal. Will receive more pilot signals (in this case, PCH-1 or PCH-2)
This makes it possible to receive a pilot symbol with little interference, improve the reliability of estimating the reference phase by the pilot signal and the delay profile by the pilot signal, and improve the communication quality. In communication using code division multiple access, there is an effect that improvement in communication quality enables an increase in subscriber capacity. Further, since information for identifying the base station antenna that has transmitted the information signal is transmitted on the downlink, the delay in the selection control of the transmission antenna can be reduced and the subscriber capacity can be increased.

(Embodiment 9) FIG. 12 is a diagram showing a slot configuration of pilot signals and information signals in a mobile communication method according to Embodiment 9 of the present invention. This figure is an example in which the number of antennas of the base station is two. In FIG. 12, PCH indicates a slot configuration of a pilot signal,
1201 is a NULL symbol that does not transmit anything, and 1202 is a predetermined pilot symbol (PL). TCH indicates a slot configuration of an information signal, 1203 is a dummy symbol (DMY) for differential detection, 1204 is an information symbol (IFD) to be differentially coded for differential detection, and 1205 is information symbol for synchronous detection. Symbol (IFS), 1206 sends nothing
It is a NULL symbol (NULL). NULL in PCH or TCH
Is not necessary.

The base station transmits a pilot signal from antenna A
PCH-1 is transmitted, and pilot signal PCH-2 is transmitted from antenna B.
Has been sent. These are spread with spread signals assigned to the respective antennas. An information signal from the base station to each mobile station selects an antenna having a good line condition, and is transmitted from one of the antennas.
These are spread with spread signals assigned to each mobile station.

The base station receives the uplink from the mobile station. From the signal received by antenna A and the signal received by antenna B, the state of the uplink transmission path is estimated. Then, one of the antennas having a better line condition is selected. The selection result shall be transmitted in the differentially encoded IFD. The mobile station receives the information signal transmitted from the base station and determines whether the base station antenna that transmitted the slot is antenna A or antenna B from the IFD subjected to delay detection. In the case of differential detection, since a pilot signal is not required, it is not necessary to consider whether the transmitted base station antenna is antenna A or antenna B. After the transmitted base station antenna is specified as a result of the differential detection, synchronous detection is performed based on the pilot signal of the antenna.

The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to the ninth embodiment of the present invention, the transmission antenna of the base station is specified by transmitting a part of the downlink information signal to the mobile station by differential coding. , The mobile station will be able to receive more pilot signals (in this case, PCH-1 or PCH-2) and receive pilot symbols with less interference,
It is possible to increase the reliability of estimating the reference phase by the pilot signal and the delay profile by the pilot signal,
Communication quality can be improved. In communication using code division multiple access, there is an effect that improvement in communication quality enables an increase in subscriber capacity. Further, since information for specifying the base station antenna that has transmitted the information signal is transmitted on the downlink, it is possible to reduce the delay of the selection control of the transmission antenna and increase the subscriber capacity.

(Embodiment 10) FIG.13 shows the configuration of a mobile communication base station apparatus according to Embodiment 10 of the present invention. This figure shows an example in which two antennas simultaneously communicate with three mobile stations. In FIG. 13, reference numeral 1301 denotes a communication line coding means for the mobile station (1), 1302 denotes a communication line coding means for the mobile station (2),
1303 is a communication line coding means for the mobile station (3). 1319 is a differential encoding means for the mobile station (1), 1320 is a differential encoding means for the mobile station (2), 1321 is a mobile station (3)
For differential encoding. 1304 is a spreading means for spreading with the spreading code 1 allocated to the mobile station (1), 1305 is a spreading means for spreading with the spreading code 2 allocated to the mobile station (2), and 1306 is allocated to the mobile station (3). This is a spreading means for spreading with the spreading code 3. 1307 is switching means for switching to an antenna for transmitting a signal to the mobile station (1), and 1308 is a mobile station.
(2) Switching means for switching to an antenna for transmitting a signal addressed to the mobile station, and 1309 means switching means for switching to an antenna for transmitting a signal addressed to the mobile station (3). A selection unit 1310 selects an antenna for transmitting a signal addressed to each mobile station. Reference numeral 1311 denotes a spreading unit that spreads a pilot signal using the spreading code 4 assigned to the antenna A, and 1312 denotes a spreading unit that spreads a pilot signal using the spreading code 5 assigned to the antenna B. Reference numeral 1313 denotes a multiplexing unit that multiplexes a signal transmitted from the antenna A, and 1314 denotes a multiplexing unit that multiplexes a signal transmitted from the antenna B. 1315 is a frequency conversion means for converting a signal transmitted from the antenna A into a radio frequency and amplifying it,
Reference numeral 16 denotes frequency conversion means for converting a signal transmitted from the antenna B into a radio frequency and amplifying the signal. 1317 is antenna A,
Reference numeral 1318 denotes an antenna B.

The operation of the mobile communication base station apparatus configured as described above will be described below. Audio information, image information, and the like applied to the mobile station (1) are encoded by the encoding means 1301. A part of the encoded signal is differentially encoded by differential encoding means 1319, and part of the encoded signal is directly transmitted to spreading means 1304, where the spreading code assigned to mobile station (1) by spreading means 1304 is provided. The signal band is spread by 1. The spread signal is connected to the multiplexing means 1313 or 1314 in the switching means 1307 according to the instruction of the selection means 1310. The same applies to the information addressed to the mobile station (2) and the information addressed to the mobile station (3). The selecting unit 1310 selects an antenna for transmitting a signal of each line according to the reception state of each line of the uplink and the decoded control information, and instructs the switching unit 1307, 1308 or 1309. The selection of the antenna is repeatedly performed in units of one or a plurality of slots.

The pilot signal of antenna A is supplied to a spreading means.
At 1311, the signal band is spread by the spreading code 4 assigned to the antenna A. The spread pilot signal is
The signal is multiplexed by the multiplexing means 1313 together with the spread signal of another line transmitted from the antenna A. The multiplexed spread signal is band-converted to a radio frequency by a frequency conversion unit 1315, amplified, and transmitted from an antenna 1317 to a mobile station in a cell. The same applies to antenna B. The mobile station receives the downlink signal from the base station and delay-detects a part of the differentially coded signal, whereby the transmitted base station antenna can be specified.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Therefore, the mobile station can always receive the pilot signal (in this case, PCH-1 or PCH-2).

Further, if a pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Further, a signal addressed to each mobile station is transmitted from only one of the antennas A and B, and an antenna having a good line condition with each mobile station is selected as an antenna to be transmitted. Upon reception at the station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to the tenth embodiment of the present invention, the transmission antenna of the base station is identified by transmitting a part of the downlink information signal to the mobile station by differential encoding. , The reliability of estimation of the reference phase by the pilot signal and the delay profile by the pilot signal can be improved, and the communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity. Further, since information for specifying the base station antenna that has transmitted the information signal is transmitted on the downlink, it is possible to reduce the delay of the selection control of the transmission antenna and increase the subscriber capacity.

In the tenth embodiment, the encoding in the encoding means is speech encoding, image encoding, or the like, but error detection encoding, error correction encoding, or the like may be further performed. . In that case, the mobile station side further performs error detection decoding and error correction decoding accordingly.

(Embodiment 11) FIG. 14 shows the configuration of a mobile communication mobile station apparatus according to Embodiment 11 of the present invention. In this figure, the base station antenna is 2
This is an example of a book. In FIG. 14, reference numeral 1401 denotes an antenna for receiving a radio signal. Reference numeral 1402 denotes a conversion unit that amplifies a signal received by the antenna 1401 and converts the signal from a radio frequency to a baseband frequency. Reference numeral 1403 denotes despreading means for detecting a correlation value of a pilot signal using a spreading code assigned to each antenna of the base station. Reference numeral 1404 denotes switching means for switching a spreading code used in despreading of a pilot signal. Despreading means 1405 detects a correlation value of an information signal using a spreading code assigned to a mobile station. 1406 is a RAKE of the correlation value of the information signal based on the correlation value of the pilot signal.
RAKE combining means for combining. Reference numeral 1407 denotes synchronous detection means for performing synchronous detection, and reference numeral 1408 denotes decoding means for reproducing information such as audio information and image information from the detected signal. 1409
Is estimation means for estimating the state of the transmission path from the correlation value of the detected pilot signal. 1410 is storage means for storing the correlation value of the detected information signal. Reference numeral 1411 denotes delay detection means for performing delay detection.

The operation of the mobile communication mobile station device configured as described above will be described below. The base station differentially encodes information for identifying an antenna to be transmitted, and transmits the information. The radio frequency signal received by the antenna 1401 is amplified by the frequency conversion means 1402, and then band-converted to a baseband frequency. This signal is split into two and transmitted to despreading means 1403 and 1405, respectively. The information signal despreading means 1405 detects the correlation value of the information signal by performing despreading using the spreading code assigned to the mobile station, and transmits it to the storage means 1410. The storage unit 1410 stores a correlation value of the detected information signal, and transmits the correlation value to the RAKE combining unit 1406. RA
The KE combining means 1406 RAKE combines the correlation value of the differentially encoded information signal from the base station to be delay-detected, and transmits the result to the delay detecting means 1411. The delay detection means 1411 performs delay detection on the information signal subjected to RAKE synthesis, specifies the transmitted base station antenna, and transmits it to the switching means 1404. On the other hand, despreading means 1403 for pilot signal performs despreading using the spreading code switched and connected by switching means 1404, detects a correlation value of the pilot signal and transmits it to estimating means 1409. Switching means 1404 connects the spreading code assigned to the antenna of the base station to which the signal has been transmitted to despreading means 1403. The estimating means 1409 averages the correlation values of the detected pilot signals and performs other processing to estimate the state of the transmission path of the line, and transmits it to the RAKE combining means 1406. RAKE combining means 1406
This time, the correlation value of the information signal is RAKE-combined based on the transmission path state estimated by the estimation means 1409, and the synchronous detection means 1407
Tell The synchronous detection means 1407 synchronously detects the information signal subjected to RAKE synthesis and transmits the information signal to the decoding means 1408. Decoding means 14
08 reproduces information transmitted from the base station, such as audio information and image information, by decoding the detected signal. Thereby, the mobile station can specify the transmitted base station antenna without referring to the pilot signal.

[0103] Signals transmitted from the same antenna of the base station reach the mobile station via the same path, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Therefore, the mobile station can always receive the pilot signal (in this case, PCH-1 or PCH-2).

Further, if a pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly large power. Also, a signal from the base station to each mobile station is transmitted only from one of the antennas A and B,
Since an antenna to be transmitted is selected to be an antenna having a good line condition with each mobile station, a desired wave component is increased at the time of reception at each mobile station. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to Embodiment 11 of the present invention, a mobile station receives a signal obtained by differentially encoding a part of an information signal for specifying a transmission antenna from a base station. The mobile station can receive more pilot signals and receive pilot symbols with less interference, and can improve the reliability of estimating the reference phase by the pilot signal and the delay profile by the pilot signal. Thus, communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

In the eleventh embodiment, the decoding by the decoding means is the decoding of voice or image. On the side, error detection decoding and error correction decoding are further performed accordingly.

(Embodiment 12) FIG. 15 is a flowchart showing processing of a mobile station receiving section of a mobile communication method according to Embodiment 12 of the present invention. Here, a case where the number of base station antennas is two will be described as an example. The base station transmits a pilot signal PCH-1 from antenna A and transmits a pilot signal PCH-2 from antenna B. These are spread with spread signals assigned to the respective antennas. The information signal from the base station to each mobile station selects an antenna having a good line condition, and is transmitted from one of the antennas.
It is spread with a spread signal assigned to each mobile station and error detection coded.

The mobile station performs the following processing as shown in FIG. 1501 The received signal is despread with the spreading code assigned to the mobile station, and the correlation value of the information signal is stored. 1502 Select one pilot signal to be the reference for synchronous detection. 1503 Despreads with a spreading code assigned to the base station antenna transmitting this pilot signal to detect a correlation value. 1504 The state of the line is estimated based on the correlation value of the pilot signal. 1505 Based on the estimation result, calculate the correlation value of the information signal with RAK.
E Synthesize. 1506 Perform synchronous detection. 1507 Temporarily decode the information signal. 1508 Perform error detection to check for errors. 1509 If no error is detected, the provisional decoding result ends as the main decoding result. 1510 If an error is detected, another pilot signal is
And repeats the process after 1503.

The selection of the pilot signal in the processing 1502 and the processing 1510 may be performed by giving priority to a signal having a higher reception level of the previous downlink, or giving priority to a signal obtained by decoding the immediately preceding downlink. By setting such priorities, the number of times of provisional decoding can be reduced on average. Also, error detection coding includes interleaving, and error detection decoding includes deinterleaving.

The mobile station must know which antenna of the base station transmitted the information signal addressed to the mobile station. In the present embodiment, the mobile station transmits information on the base station antenna transmitting the broadcast signal. There is no need to transmit from the base station to the mobile station or from the mobile station to the base station. And
Since the control information for the uplink and the downlink does not increase, the communication quality does not decrease. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to the twelfth embodiment of the present invention, the base station performs error detection coding on the downlink information signal, and the mobile station bases the information signal on the basis of the pilot signal of each antenna of the base station. The mobile station moves from the base station by performing tentative decoding, estimating which antenna the base station transmitted from the tentative decoding result, and using the tentative decoding result based on the pilot signal in which no error was detected as the decoding result. Since it is not necessary for the station to transmit information for identifying the base station antenna that has transmitted the information signal, the subscriber capacity can be increased without lowering the transmission efficiency of the downlink and uplink.

(Thirteenth Embodiment) FIG. 16 shows the configuration of a mobile communication base station apparatus according to a thirteenth embodiment of the present invention. This figure shows an example in which two antennas simultaneously communicate with three mobile stations. In FIG. 16, reference numeral 1601 denotes a communication line coding means for the mobile station (1), 1602 denotes a communication line coding means for the mobile station (2),
1603 is a communication line coding means for the mobile station (3). 1619 is an error detection coding means for the mobile station (1), 16
20 is an error detection coding means for the mobile station (2), and 1621 is an error detection coding means for the mobile station (3). 1604 is spreading means for spreading with the spreading code 1 allocated to the mobile station (1), 1605 is spreading means for spreading with the spreading code 2 allocated to the mobile station (2), and 1606 is allocated to the mobile station (3). This is a spreading means for spreading with the spreading code 3. 1607 is a mobile station (1)
Switching means for switching to an antenna for transmitting a destination signal,
Reference numeral 1608 denotes switching means for switching to an antenna for transmitting a signal addressed to the mobile station (2), and reference numeral 1609 denotes switching means for switching to an antenna for transmitting a signal addressed to the mobile station (3). Reference numeral 1610 denotes selection means for selecting an antenna for transmitting a signal addressed to each mobile station. Reference numeral 1611 denotes spreading means for spreading the pilot signal using the spreading code 4 assigned to the antenna A, and reference numeral 1612 denotes spreading means for spreading the pilot signal using the spreading code 5 assigned to the antenna B. 1613 is a multiplexing means for multiplexing a signal transmitted from the antenna A, and 1614 is a multiplexing means for multiplexing a signal transmitted from the antenna B. Reference numeral 1615 denotes frequency conversion means for converting a signal transmitted from the antenna A into a radio frequency and amplifying the signal, and reference numeral 1616 denotes frequency conversion means for converting a signal transmitted from the antenna B into a radio frequency and amplifying the same. 1617 is an antenna A and 1618 is an antenna B.

The operation of the mobile communication base station apparatus configured as described above will be described below. Audio information, image information, and the like applied to the mobile station (1) are encoded by the encoding means 1601. The coded signal is subjected to error detection coding in error detection coding means 1619 and spread means 1604
The signal band is spread by the spreading means 1604 with the spreading code 1 assigned to the mobile station (1). The spread signal is connected to the multiplexing means 1613 or 1614 in the switching means 1607 according to the instruction of the selection means 1610. Mobile station
The same applies to information destined for (2) and mobile station (3). The selecting unit 1610 selects an antenna for transmitting a signal of each line according to the reception state of each line of the uplink and the decoded control information, and instructs the switching unit 1607, 1608 or 1609. The selection of the antenna is repeatedly performed in units of one or a plurality of slots. The pilot signal of antenna A is spread by spreading means 1611 with a spreading code 4 assigned to antenna A. The spread pilot signal is multiplexed in multiplexing means 1613 together with the spread signal of another line transmitted from antenna A.
The multiplexed spread signal is band-converted to a radio frequency by frequency conversion means 1615, and then amplified and
To the mobile station in the cell. The same applies to antenna B. The mobile station receives and decodes the downlink signal from the base station and switches the pilot signal until no error is detected, thereby obtaining information for identifying the base station antenna from which the information signal was transmitted. The base station antenna that has transmitted the information signal can be specified without transmitting the signal on the uplink or the downlink.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Therefore, the mobile station can always receive the pilot signal (in this case, PCH-1 or PCH-2).

If the pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Also, a signal from the base station to each mobile station is transmitted only from one of the antennas A and B,
Since an antenna to be transmitted is selected to be an antenna having a good line condition with each mobile station, a desired wave component is increased at the time of reception at each mobile station. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink,
Can follow high-speed fluctuations.

As described above, according to Embodiment 13 of the present invention, by providing the base station with an error detection function,
It is possible to specify the base station antenna that has transmitted the information signal without transmitting information for specifying the base station antenna to which the information signal has been transmitted on the downlink. By specifying the base station antenna that has transmitted the information signal, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal can be improved, and the communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

In the thirteenth embodiment, the encoding in the encoding means is audio encoding, image encoding, or the like, but may be further subjected to error correction encoding. In this case, the mobile station performs error correction decoding accordingly.

(Embodiment 14) FIG. 17 shows the configuration of a mobile communication mobile station apparatus according to Embodiment 14 of the present invention. In this figure, the base station antenna is 2
This is an example of a book. In FIG. 17, reference numeral 1701 denotes an antenna for receiving a radio signal. Reference numeral 1702 denotes frequency conversion means for amplifying a signal received by the antenna 1701 and converting the signal from a radio frequency to a baseband frequency. Reference numeral 1703 denotes despreading means for detecting the correlation value of the pilot signal using the spreading code assigned to the antenna A of the base station. Reference numeral 1712 denotes the correlation of the pilot signal using the spreading code assigned to the antenna B of the base station. Despreading means for detecting a value. 1713 is storage means for storing the correlation value of the pilot signal transmitted from the antenna A of the base station, and 1714 is storage means for storing the correlation value of the pilot signal transmitted from the antenna B of the base station. Reference numeral 1709 denotes an estimating means for estimating the state of the transmission path from the correlation value of the detected pilot signal. Reference numeral 1704 denotes switching means for switching the correlation value of the pilot signal used for estimation. Reference numeral 1705 denotes despreading means for detecting a correlation value of an information signal using a spreading code assigned to a mobile station.
1710 is storage means for storing the correlation value of the detected information signal. Reference numeral 1706 denotes RAKE combining means for performing RAKE combining of the correlation value of the information signal based on the correlation value of the pilot signal. Reference numeral 1707 denotes detection means for performing synchronous detection. Reference numeral 1711 denotes error detection decoding means for performing error detection decoding from the detected signal. Reference numeral 1708 denotes decoding means for reproducing information such as audio information and image information from the detected signal.

The operation of the mobile communication mobile station apparatus configured as described above will be described below. The information signal transmitted from the base station is subjected to error detection coding. The radio frequency signal received by the antenna 1701 is amplified by the frequency conversion means 1702, and then band-converted to a baseband frequency. This signal is divided into three parts and transmitted to despreading means 1703, 1712 and 1705, respectively. Despreading means
In 1703, the correlation value of the pilot signal is detected by performing despreading using the spreading code assigned to the antenna A of the base station and transmitted to the storage unit 1713. The despreading unit 1712 detects the correlation value of the pilot signal by performing despreading using the spreading code assigned to the antenna B of the base station,
Tell 14 The switching means 1704 is a storage means 1713 or 1714
And one of them is connected to the estimating means 1709. The estimating means 1709 averages the correlation values of the detected pilot signals and performs other processing to estimate the state of the transmission path of the line, and transmits it to the RAKE combining means 1706. On the other hand, despreading means 1705
Then, the mobile station despreads using the spreading code assigned to the mobile station, detects the correlation value of the information signal, and transmits it to the storage unit 1710. The storage unit 1710 stores the correlation value of the detected information signal and transmits the correlation value to the RAKE combining unit 1706. RAKE combining means 17
In 06, the correlation value of the information signal is RAKE-combined based on the transmission path state estimated by the estimation unit 1709, and the synchronous detection unit 1707 is used.
Tell Synchronous detection means 1707 synchronously detects the information signal subjected to RAKE synthesis and transmits it to error detection decoding means 1711. Error detection decoding means 1711 performs error detection decoding, and when an error is detected, instructs switching means 1704 to select another despread pilot signal, and repeats the estimation from the transmission path state again. If no error is detected, the decoding unit 1708 decodes the detected signal to reproduce information transmitted from the base station, such as audio information and image information.

In the base station, pilot signal PCH-1 is transmitted from antenna A, and pilot signal PCH-
Sending 2. These are spread with spread signals assigned to the respective antennas. An information signal addressed to each mobile station is selected from antennas having good line conditions, and transmitted from one of the antennas. Has been

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Therefore, the mobile station can always receive the pilot signal (in this case, PCH-1 or PCH-2). The pilot signal can also be transmitted with a large amount of power as the number of multiplexes is reduced. A signal from the base station to each mobile station is transmitted only from one of the antennas A and B, and an antenna to be transmitted is selected from antennas having good line conditions with each mobile station. Upon reception at the mobile station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to Embodiment 14 of the present invention, by providing the mobile station with the error detection function,
The base station antenna that has transmitted the information signal can be specified without transmitting information for specifying the base station antenna to which the information signal has been transmitted on the uplink. By specifying the base station antenna that has transmitted the information signal, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal can be improved, and the communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

In Embodiment 14, decoding by the decoding means is decoding of voice or image. However, when error correction coding or the like is performed on the base station side, the mobile station side performs the corresponding processing. Further, error correction decoding is performed.

(Embodiment 15) Next, a mobile communication method according to claim 17 of the present invention will be described. FIG.
8 (a) is a syndrome table of error correction in the conventional mobile communication method, and is an example showing a result of detecting an information signal of a certain mobile station based on a pilot signal PCH-1 transmitted from the antenna A. , The total number of syndromes is N. Here, a case where the number of base station antennas is two will be described as an example. The base station receives a pilot signal PCH-1 from antenna A.
And a pilot signal PCH-2 is transmitted from the antenna B. These are spread with spread signals assigned to the respective antennas. The information signal from the base station to each mobile station selects an antenna with a good line condition and is transmitted from one of the antennas, and these are spread by the spread signal assigned to each mobile station, and Error correction coding is performed.

FIG. 18B shows an example of the result of detecting the information signal of the same mobile station based on the pilot signal PCH-2 transmitted from the antenna B. The likelihood in the figure indicates the degree of coincidence between the received pattern and each information pattern, and the larger this value is, the more likely it is. Assuming that the information signal is transmitted from the base station antenna A, the probability of the syndrome 4 is highest from FIG. 18A, and if the information signal is transmitted from the base station antenna B, the syndrome is determined from FIG. The certainty of 2 is the highest. Therefore, the decoding result differs depending on whether the signal is transmitted from the base station antenna A or the base station antenna A, and the mobile station must recognize which antenna has been transmitted.

FIG. 18C is a syndrome table for error correction in the mobile communication method according to the fifteenth embodiment. It is the same that the total number of syndromes is an example of N. FIG. 18A and FIG. 18B are combined into one syndrome table. The most probable is Syndrome 4 for PCH-1. Thus, decoding is possible even if the transmitted base station antenna is not recognized by the mobile station. This eliminates the need to transmit information on the base station antenna transmitting the information signal from the base station to the mobile station or from the mobile station to the base station. Since the control information of the uplink and the downlink does not increase, the communication quality does not decrease. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to the fifteenth embodiment of the present invention, the base station performs error correction coding on the downlink information signal, and the mobile station converts the information signal based on the pilot signal of each antenna of the base station. By performing error correction decoding, it is intended to estimate from which antenna of the base station transmission was performed, and information for identifying the base station antenna which transmitted the information signal from both the base station and the mobile station was used. Since there is no need to transmit, the subscriber capacity can be increased without lowering the transmission efficiency of the downlink and uplink.

Although the fifteenth embodiment has been described with reference to the block code as the error correction coding, the same applies to the convolutional code. Further, error correction coding includes interleaving, and error correction decoding includes deinterleaving.

(Embodiment 16) FIG. 19 shows the configuration of a mobile communication base station apparatus according to Embodiment 16 of the present invention. This figure shows an example in which two antennas simultaneously communicate with three mobile stations. In FIG. 19, reference numeral 1901 denotes a communication line coding means for the mobile station (1), 1902 denotes a communication line coding means for the mobile station (2),
Reference numeral 1903 denotes a communication line coding unit for the mobile station (3). 1919 is an error correction coding means for the mobile station (1), 19
20 is an error correction coding means for the mobile station (2), and 1921 is an error correction coding means for the mobile station (3). Reference numeral 1904 denotes spreading means for spreading with the spreading code 1 assigned to the mobile station (1), 1905 denotes spreading means for spreading with the spreading code 2 assigned to the mobile station (2), and 1906 denotes spreading means assigned to the mobile station (3). This is a spreading means for spreading with the spreading code 3. 1907 is a mobile station (1)
Switching means for switching to an antenna for transmitting a destination signal,
Reference numeral 1908 denotes switching means for switching to an antenna for transmitting a signal addressed to the mobile station (2), and reference numeral 1909 denotes switching means for switching to an antenna for transmitting a signal addressed to the mobile station (3). Reference numeral 1910 denotes selection means for selecting an antenna for transmitting a signal addressed to each mobile station. Reference numeral 1911 denotes spreading means for spreading a pilot signal using the spreading code 4 assigned to the antenna A, and 1912 denotes spreading means for spreading the pilot signal using the spreading code 5 assigned to the antenna B. Reference numeral 1913 denotes a multiplexing unit that multiplexes a signal transmitted from the antenna A, and 1914 denotes a multiplexing unit that multiplexes a signal transmitted from the antenna B. Reference numeral 1915 denotes frequency conversion means for converting a signal transmitted from the antenna A to a radio frequency and amplifying it, and reference numeral 1916 denotes frequency conversion means for converting a signal transmitted from the antenna B to a radio frequency and amplifying it. 1917 is an antenna A, and 1918 is an antenna B.

The operation of the mobile communication base station apparatus configured as described above will be described below. Audio information, image information, and the like applied to the mobile station (1) are encoded by the encoding unit 1901. The coded signal is subjected to error correction coding in error correction coding means 1919 and spread signal 1904
The transmitted signal band is spread by the spreading means 1904 with the spreading code 1 assigned to the mobile station (1). The spread signal is connected to the multiplexing means 1913 or 1914 in the switching means 1907 according to the instruction of the selection means 1910. Mobile station
The same applies to information destined for (2) and mobile station (3). The selecting unit 1910 selects an antenna for transmitting a signal of each line according to the reception state of each line of the uplink and the decoded control information, and instructs the switching unit 1907, 1908 or 1909. The selection of the antenna is repeatedly performed in units of one or a plurality of slots. The pilot signal of the antenna A is spread by the spreading means 1911 with the spreading code 4 assigned to the antenna A. The spread pilot signal is multiplexed in a multiplexing unit 1913 with the spread signal of another line transmitted from antenna A.
The multiplexed spread signal is band-converted to a radio frequency by a frequency conversion unit 1915, and then amplified to be an antenna 1917.
To the mobile station in the cell. The same applies to antenna B. The mobile station receives the downlink signal from the base station and switches the pilot signal in the process of error correction decoding, so that information for identifying the base station antenna from which the information signal was transmitted can be transmitted to the uplink. The base station antenna that has transmitted the information signal can be specified without transmitting even on the downlink.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Therefore, the mobile station can always receive the pilot signal (in this case, PCH-1 or PCH-2).

Further, if a pilot signal is not transmitted in a section that has been used as a conventional pilot symbol section, the number of multiplexed pilot signals in that section is reduced, and it is possible to transmit with a correspondingly higher power. Also, a signal from the base station to each mobile station is transmitted only from one of the antennas A and B,
Since an antenna to be transmitted is selected to be an antenna having a good line condition with each mobile station, a desired wave component is increased at the time of reception at each mobile station. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. Further, the switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmitting antenna at the base station and the specification at the mobile station are completed for each slot of the downlink,
Can follow high-speed fluctuations.

As described above, according to Embodiment 16 of the present invention, by providing the base station with the error correction function,
It is possible to specify the base station antenna that has transmitted the information signal without transmitting information for specifying the base station antenna to which the information signal has been transmitted on the downlink. By specifying the base station antenna that has transmitted the information signal, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal can be improved, and the communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

In the sixteenth embodiment, the encoding by the encoding means is speech encoding, image encoding, or the like, but may be error detection encoding or the like.
In that case, the mobile station side further performs error detection decoding accordingly.

(Embodiment 17) FIG. 20 shows the configuration of a mobile communication mobile station apparatus according to Embodiment 17 corresponding to claim 19 of the present invention. In this figure, the base station antenna is 2
This is an example of a book. In FIG. 20, reference numeral 2001 denotes an antenna for receiving a radio signal. Reference numeral 2002 denotes conversion means for amplifying a signal received by the antenna 2001 and converting the signal from a radio frequency to a baseband frequency. 2003 is base station antenna A
Despreading means for detecting the correlation value of the pilot signal using the spreading code assigned to the base station, and 2012 despreading means for detecting the correlation value of the pilot signal using the spreading code assigned to the antenna B of the base station. It is. 2009 is estimating means for estimating the state of the transmission path from the correlation value of the pilot signal transmitted from the antenna A of the base station, and 2011 is the state of the transmission path from the correlation value of the pilot signal transmitted from the antenna B of the base station. Is an estimating means for estimating. Despreading means 2005 detects a correlation value of an information signal using a spreading code assigned to a mobile station. 2010 is storage means for storing the correlation value of the detected information signal. 2006 is RAKE of the correlation value of the information signal based on the correlation value of the pilot signal PCH-1.
RAKE combining means for combining, 2013 is the pilot signal
RAKE combining means for performing RAKE combining of the correlation value of the information signal based on the correlation value of PCH-2. 2007 is synchronous detection means for performing synchronous detection on the output of RAKE combining means 2006, and 2014 is RA
There is a synchronous detection unit that performs synchronous detection on the output of the KE combining unit 2013. Reference numeral 2004 denotes error correction decoding means for performing error correction decoding from the detected signal. 2008 is decoding means for reproducing information such as audio information and image information from the signal after error correction decoding.

The operation of the mobile communication mobile station apparatus configured as described above will be described below. The information signal transmitted from the base station has been subjected to error correction coding.
The radio frequency signal received by the antenna 2001 is amplified by the frequency conversion means 2002, and then band-converted to a baseband frequency. This signal is split into three and transmitted to despreading means 2003, 2012 and 2005, respectively. The despreading means 2003 despreads using the spreading code assigned to the antenna A of the base station, detects the correlation value of the pilot signal, and transmits it to the estimating means 2009. The despreading means 2012 detects the correlation value of the pilot signal by performing despreading using the spreading code assigned to the antenna B of the base station,
Tell 2011. The estimating means 2009 averages the correlation value of the pilot signal PCH-1 detected by the despreading means 2003 or performs other processing to estimate the state of the transmission path of the line, and transmits it to the RAKE combining means 2006. The estimating means 2011 averages the correlation value of the pilot signal PCH-2 detected by the despreading means 2012,
Estimate the transmission path status of the line by performing other processing, and
Communicate to synthesis means 2013. On the other hand, the despreading means 2005 detects the correlation value of the information signal by performing despreading using the spreading code assigned to the mobile station, and transmits it to the storage means 2010. Storage means
In 2010, the correlation value of the detected information signal is stored and RA
Communicate to KE synthesis means 2006 and 2013. In RAKE combining means 2006, based on the transmission path state estimated by estimation means 2009,
The correlation value of the information signal is RAKE-combined and transmitted to the synchronous detection means 2007. In the other RAKE combining means 2013, the correlation value of the information signal is calculated based on the transmission path state estimated by the estimating means 2011.
KE synthesized and transmitted to synchronous detection means 2014. Synchronous detection means 20
At 07, the RAKE-combined information signal is synchronously detected and transmitted to the error correction decoding means 2004. In the other synchronous detection means 2014, the information signal subjected to RAKE synthesis is synchronously detected and transmitted to the error correction decoding means 2004. The error correction decoding means 2004 performs error correction decoding on the outputs of the synchronous detection means 2007 and 2014 respectively, and in the process, determines from which antenna of the base station the information signal has been transmitted, and Tell The decoding means 2008 decodes the detected signal and reproduces information transmitted from the base station, such as audio information and image information.

At the base station, pilot signal PCH- 1 is transmitted from antenna A, and pilot signal PCH-
Sending 2. These are spread with spread signals assigned to the respective antennas. The information signal from the base station to each mobile station selects an antenna with a good line condition and is transmitted from one of the antennas, and these are spread by the spread signal assigned to each mobile station, and Error correction coding is performed.

Signals transmitted from the same antenna of the base station reach the mobile station via the same route, so that the line conditions due to fading and the like are equal. Therefore, the signal transmitted from antenna A can be used to estimate the reference phase and delay profile using PCH-1, and the signal transmitted from antenna B can be used to estimate the reference phase and delay profile using PCH-2. Estimation is possible. Therefore, the mobile station can always receive the pilot signal (in this case, PCH-1 or PCH-2). The pilot signal can also be transmitted with a large amount of power as the number of multiplexes is reduced. A signal from the base station to each mobile station is transmitted only from one of the antennas A and B, and an antenna to be transmitted is selected from antennas having good line conditions with each mobile station. Upon reception at the mobile station, the component of the desired wave is increased. On the other hand, the component becomes an interference wave for other mobile stations, but this interference wave component is not increased on average. The switching of the transmitting antenna can be performed following the instantaneous fluctuation of the line state. In particular, when the determination of the transmission antenna at the base station and the specification at the mobile station are completed for each slot of the downlink, it is possible to follow a high-speed fluctuation.

As described above, according to Embodiment 17 of the present invention, by providing the mobile station with the error correction function,
The base station antenna that has transmitted the information signal can be specified without transmitting information for specifying the base station antenna to which the information signal has been transmitted on the uplink. By specifying the base station antenna that has transmitted the information signal, the reliability of estimating the reference phase based on the pilot signal and the delay profile based on the pilot signal can be improved, and the communication quality can be improved. In communication using code division multiple access, the effect of improving communication quality enables an increase in subscriber capacity.

(Embodiment 18) Next, a mobile communication method according to claims 20, 21, and 22 of the present invention will be described. As described in Embodiments 1 to 17 above, by transmitting a pilot signal spread with a spreading code assigned to each of a plurality of antennas of a base station, in a downlink (Fw), a section including only a pilot symbol is transmitted. The synchronous detection becomes possible even without providing the. Therefore, conventionally,
It is possible to delete the section used as the pilot symbol section of the downlink from the downlink and expand the pilot symbol section of the uplink (Rv) accordingly.

FIG. 21 is a diagram showing the slots of the upper and lower lines in the time division duplex system of the mobile communication system. FIG.
FIG. 21A shows an example of a conventional communication system, and FIG.
(B) is an example in the present invention. On the downlink, the mobile station can receive many pilot symbols in a slot by transmitting pilot signals (PCH-1 and PCH-2) for each antenna of the base station. However, in the uplink, if each mobile station multiplexes a pilot symbol with an information symbol, the amount of interference due to the pilot symbol greatly increases.
It is difficult to multiplex pilot symbols with information symbols. Therefore, by using the slot configuration as shown in FIG. 21B and replacing the section that has conventionally been the pilot symbol section of the downlink with the pilot symbol section of the uplink, it is possible to receive many pilot symbols also in the uplink. And the communication quality of the information signal can be improved.

As described above, according to the eighteenth embodiment of the present invention, the subscriber capacity can be increased by reducing the pilot section on the downlink and expanding the pilot symbol section on the uplink. .

[0143]

As described above, according to the present invention, a plurality of antennas are provided in a base station, and different pilot signals are transmitted for each antenna, so that the communication quality of a communication line can be improved or a subscriber of a communication system can be improved. The effect that the capacity can be increased is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a time change of a base station transmission signal according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of a mobile communication base station apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a block diagram showing a configuration of a mobile communication mobile station device according to Embodiment 3 of the present invention.

FIG. 4 is a schematic diagram showing a slot configuration of a pilot signal in a mobile communication method according to Embodiment 4 of the present invention.

FIG. 5 is a schematic diagram showing a slot configuration of an information signal in a mobile communication method according to Embodiment 4 of the present invention.

FIG. 6 is a schematic diagram showing a slot configuration of a pilot signal in a mobile communication method according to Embodiment 4 of the present invention.

FIG. 7 is a block diagram showing a configuration of a mobile communication base station apparatus according to Embodiment 5 of the present invention.

FIG. 8 is a block diagram showing a configuration of a mobile communication mobile station device according to Embodiment 6 of the present invention.

FIG. 9 is a schematic diagram showing a system configuration of a base station and a mobile station according to Embodiment 7 of the present invention.

FIG. 10 is a schematic diagram showing a slot configuration of a mobile communication method according to an eighth embodiment of the present invention.

FIG. 11 is a schematic diagram showing another slot configuration of the mobile communication method according to the eighth embodiment of the present invention.

FIG. 12 is a schematic diagram showing a slot configuration of a mobile communication method according to Embodiment 9 of the present invention.

FIG. 13 is a block diagram showing a configuration of a mobile communication base station apparatus according to Embodiment 10 of the present invention.

FIG. 14 is a block diagram showing a configuration of a mobile communication mobile station device according to Embodiment 11 of the present invention.

FIG. 15 is a flowchart showing a mobile station reception process of the mobile communication method according to Embodiment 12 of the present invention.

FIG. 16 is a block diagram showing a configuration of a mobile communication base station apparatus according to Embodiment 13 of the present invention.

FIG. 17 is a block diagram showing a configuration of a mobile communication mobile station device according to Embodiment 14 of the present invention.

FIGS. 18 (a) and 18 (b) are a list of error correction syndromes of a mobile communication method in a conventional example. FIG. 18 (c) is a list of error correction syndromes of a mobile communication method according to Embodiment 15 of the present invention.

FIG. 19 is a block diagram showing a configuration of a mobile communication base station apparatus according to Embodiment 16 of the present invention.

FIG. 20 is a block diagram showing a configuration of a mobile communication mobile station device according to Embodiment 17 of the present invention.

FIG. 21 is a schematic diagram showing a slot configuration of an uplink and a downlink in a mobile communication method according to Embodiment 18 of the present invention.

FIG. 22 is a schematic diagram showing a system configuration of a base station, its communication area, and a mobile station.

FIG. 23 is a schematic diagram showing a slot configuration in a conventional interpolation type synchronous detection system.

FIG. 24 is a schematic diagram showing a time change of a base station transmission signal in a conventional interpolation type synchronous detection system.

FIG. 25 is a schematic diagram showing a time change of a base station transmission signal in a conventional pilot channel type synchronous detection system.

FIG. 26 is a schematic diagram showing a time change of a base station transmission signal in a conventional multicode transmission system using interpolation synchronous detection.

[Explanation of symbols]

 0201, 0202, 0203 Encoding means 0204, 0205, 0206 Spreading means for information signals 0207, 0208, 0209 Switching means 0212 Selection means 0211, 0212 Spreading means for pilot signals 0213, 0214 Multiplexing means 0215, 0216 Frequency conversion means 0217 , 0218 Antenna 0301 Antenna 0302 Frequency conversion means 0303, 0305 Despreading means 0304 Switching means 0306 RAKE combining means 0307 Synchronous detection means 0308 Decoding means

Claims (22)

[Claims] In a mobile communication method for performing communication on a plurality of channels using code division multiple access, a base station includes a plurality of transmission antennas, and a predetermined pilot signal is transmitted from each antenna to each antenna. And a signal spread by a different spreading code from the spreading code of the pilot signal, wherein the information signal for each line transmitted from each antenna is allocated to each line and spread by a different spreading code. A mobile communication method in which multiplexed transmission is performed, and a mobile station performs synchronous detection by performing RAKE combining based on a pilot signal of a base station antenna to which information signals of respective channels have been transmitted. 2. A mobile communication base station apparatus for communicating with a mobile station using diversity transmission with a plurality of antennas using a plurality of antennas using code division multiple access, wherein an information signal communicated for each line is encoded. Means, means for spreading an encoded signal with a spreading code assigned to each line, means for switching an antenna to be transmitted for each line,
Means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing a spread signal transmitted from each antenna, and means for converting a multiplexed signal transmitted from each antenna into a radio frequency and transmitting the signal. Mobile communication base station device provided. 3. A means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to claim 2 and converting the signal into a baseband signal, and the received information signal is allocated to a line of the own station. Means for despreading with a spreading code, means for selecting a spreading code suitable for a received pilot signal, means for despreading a received pilot signal, and RAKE for a line signal based on the despread pilot signal.
A mobile communication mobile station apparatus comprising: means for synthesizing; means for synchronously detecting a rake-combined signal; and means for decoding line communication information from the detected signal. 4. The mobile communication method according to claim 1, wherein a pilot signal for each antenna of the base station is spread and multiplexed only for a symbol at a predetermined position in each slot. 5. The system according to claim 1, wherein the information signal of each channel is spread and multiplexed only for symbols at predetermined positions which do not overlap with the pilot signal in each slot. Mobile communication method. 6. A mobile base station apparatus for communicating a plurality of lines using diversity transmission with a plurality of antennas using code division multiple access, means for encoding an information signal communicated for each line, Means for spreading the multiplexed signal with a spreading code assigned to each line, means for switching an antenna to be transmitted for each line, means for spreading a pilot signal with a spreading code assigned to each antenna, Means for connecting the pilot signal to the next stage in a symbol unit at a predetermined position in the slot,
Means for multiplexing the connected spread signals for each antenna,
Means for converting a multiplexed signal to be transmitted for each antenna into a radio frequency and transmitting the converted signal. 7. A mobile base station apparatus for communicating a plurality of lines using diversity transmission with a plurality of antennas by using code division multiple access, means for coding an information signal to be communicated for each line, Means for spreading the multiplexed signal with a spreading code assigned to each line, means for switching an antenna to be transmitted for each line, means for spreading a pilot signal with a spreading code assigned to each antenna, Means for connecting the connected information signal to the next stage at a predetermined position in the slot in a symbol unit, means for multiplexing the connected spread signal for each antenna, and wirelessly transmitting a multiplex signal to be transmitted for each antenna. A mobile communication base station device comprising: means for converting to a frequency and transmitting the converted signal. 8. A means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to claim 6 or 7 and converting the signal into a baseband signal, and converting the received information signal into a line of the own station. Means for despreading with a spreading code assigned to, means for storing an information signal of the despread line,
Means for selecting a spreading code suitable for the received pilot signal, means for despreading the received pilot signal,
Means for estimating the line condition from the despread pilot signal; and RAK for converting the line signal based on the estimated line condition.
A mobile communication mobile station apparatus comprising: means for performing E-combining; means for synchronously detecting a RAKE-combined signal; and means for decoding line communication information from the detected signal. 9. The mobile station according to claim 1, wherein an instruction of a base station antenna for transmitting a downlink is transmitted from the mobile station to the base station via the uplink.
The mobile communication method as described. 10. The mobile communication according to claim 5, wherein an instruction of a base station antenna for transmitting a downlink is transmitted from the base station to the mobile station based on a position of a symbol which does not transmit a downlink information signal. Method. 11. A base station differentially encodes information for identifying a transmission antenna in a downlink information signal and transmits the information, and a mobile station identifies the transmission antenna of the base station by delay-detecting the information. The mobile communication method according to claim 1, wherein the mobile communication method is performed. 12. A mobile base station apparatus which communicates a plurality of lines using code division multiple access using diversity transmission by a plurality of antennas, means for encoding an information signal communicated for each line, Means for differentially encoding a part of the information signal encoded for each line, means for spreading the encoded signal with a spreading code assigned to each line, and an antenna for transmitting each line Means for switching,
Means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing a spread signal transmitted from each antenna, and means for converting a multiplexed signal transmitted from each antenna into a radio frequency and transmitting the signal. Mobile communication base station device provided. 13. A means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to claim 12 and converting the signal to a baseband signal, and wherein the received information signal is allocated to a line of the own station. Means for despreading with a spreading code,
Means for storing the information signal of the despread line, means for selecting a spreading code suitable for the received pilot signal,
Means for despreading the received pilot signal, means for estimating the line condition from the despread pilot signal, means for RAKE combining the signal of the line based on the estimated line condition, and information signal RAKE-combined Means for delay detection of a part of the signal and transmitting it to means for selecting a spreading code for despreading the pilot signal, means for synchronously detecting the rake-combined signal, and means for decoding line communication information from the detected signal A mobile communication mobile station device comprising: 14. A base station performs error detection coding of a downlink information signal, and a mobile station performs temporary decoding of an information signal based on a pilot signal of each antenna of the base station. 6. The mobile unit according to claim 1, wherein an antenna from which antenna is transmitted is estimated, and a temporary decoding result based on a pilot signal in which no error is detected is used as a decoding result. Communication method. 15. A mobile communication base station apparatus for communicating a plurality of lines using diversity transmission by a plurality of antennas using code division multiple access, means for encoding an information signal communicated for each line, Means for further error detection coding of the information signal coded for each line, means for spreading the error detection coded signal with a spreading code assigned to each line, and an antenna for transmitting each line Means for switching, means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing spread signals transmitted from each antenna, and conversion of a multiplexed signal transmitted from each antenna to a radio frequency. A mobile communication base station apparatus comprising: means for transmitting. 16. A means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to claim 15 and converting the signal into a baseband signal, and the received information signal is allocated to a line of the own station. Means for despreading with a spreading code, means for storing an information signal of the despread line, means for despreading a pilot signal corresponding to each antenna of the base station, and means for storing the despread pilot signal,
Means for selecting one of the despread pilot signals, means for estimating the line condition from the selected pilot signal,
Means for RAKE combining the line signal based on the estimated line state, means for synchronously detecting the RAKE-combined signal, and provisional decoding of the line communication information from the detected signal to determine whether an error has been detected. Determining, when an error is detected, an error detection decoding means for transmitting to a means for selecting a despread pilot signal so as to select another pilot signal, and means for decoding communication information in which no error is detected. A mobile communication mobile station device comprising: 17. A base station performs error correction coding on a downlink information signal, and a mobile station performs error correction decoding of an information signal based on a pilot signal of each antenna of the base station. 5. The method according to claim 1, wherein whether the signal is transmitted from an antenna is estimated.
Or the mobile communication method according to claim 5. 18. A mobile communication base station apparatus for communicating a plurality of lines using diversity transmission by a plurality of antennas using code division multiple access, means for encoding an information signal communicated for each line, Means for further error correction coding the information signal coded for each line, means for spreading the error correction coded signal with a spreading code assigned to each line, and an antenna for transmitting each line Means for switching, means for spreading a pilot signal with a spreading code assigned to each antenna, means for multiplexing spread signals transmitted from each antenna, and conversion of a multiplex signal transmitted from each antenna to radio frequency for transmission Mobile communication base station apparatus comprising: 19. A means for receiving a radio frequency signal transmitted from the mobile communication base station apparatus according to claim 18 and converting the signal into a baseband signal, and the received information signal is allocated to a line of the own station. Means for despreading with a spreading code, means for storing the information signal of the despread channel, means for despreading pilot signals corresponding to a plurality of antennas of the base station, and channel despreading from each despread pilot signal. A means for estimating the state, a means for RAKE combining the information signals of the lines based on the estimated line states, a means for synchronously detecting the information signals RAKE-combined, and a plurality of detected information signals. A mobile communication mobile station device comprising: means for error-correcting decoding of communication information of a line by means of an error correction; 20. The method according to claim 1, wherein a downlink section is reduced and an uplink section is expanded by using a time division duplex system. 18. The mobile communication method according to claim 11, claim 14, or claim 17. 21. The method according to claim 2, wherein the downlink section is reduced and the uplink section is expanded by using a time division duplex system.
19. The mobile communication base station apparatus according to claim 15, wherein 22. An apparatus according to claim 3, wherein the downlink section is reduced and the uplink section is expanded using a time division duplex system.
20. A mobile communication mobile station device according to claim 19.